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Explainable AI technique
Class activation mapping methods are explainable AI (XAI) techniques used to visualize the regions of an input image that are the most relevant for a particular
Class_activation_mapping
Type of image
data to more complex algorithms, such as integrated gradients and class activation mapping. In transformer architecture, attention mechanisms led to analogous
Saliency_map
Type of immune cell
signaling required for T cell activation. Lck activation is controlled by the opposing actions of CD45 and Csk. CD45 activates Lck by dephosphorylating a
T_helper_cell
Smooth approximation of one-hot arg max
the last activation function of a neural network to normalize the output of a network to a probability distribution over predicted output classes. The softmax
Softmax_function
Property of artificial neural networks
generalized the class of activation functions considered by Funahashi to include unbounded, non-monotonic, discontinuous, and measurable activation functions
Universal approximation theorem
Universal_approximation_theorem
Protein-coding gene in the species Homo sapiens
interleukin(IL)-1- & interleukin-2-dependent proliferation in activated T cells, as well as the activation of quiescent helper T cells and cytotoxic T cells. Similarly
TGF_beta_1
Optimization algorithm for artificial neural networks
function and activation functions do not matter as long as they and their derivatives can be evaluated efficiently. Traditional activation functions include
Backpropagation
Protein complex on the surface of T cells that recognizes antigens
stronger activation of the T cell. Furthermore, T cells are highly sensitive; interaction with a single pMHC is enough to trigger activation. T cells
T-cell_receptor
White blood cells of the immune system
complete activation of the IL-2 gene. While in most cases activation is dependent on TCR recognition of antigen, alternative pathways for activation have
T_cell
Standard to facilitate communication between systems on diverse platforms
(servant activation) or dynamically chosen each time the method on that object is invoked (servant location). Both servant locator and servant activator can
Common Object Request Broker Architecture
Common_Object_Request_Broker_Architecture
Cytokine
kinase phosphorylates and activates the type 1 receptor kinase to initiate a signaling cascade. This leads to the activation of different downstream substrates
Transforming growth factor beta
Transforming_growth_factor_beta
New Zealand cancer genomics researcher
Christensen. His 1995 thesis was titled Investigation of the leucocyte activation antigens CG-1, CD100 and HML-1. Print continued his research with a four-year
Cristin_Print
Set of specifications extending Java SE
eclipse.angus:angus-mail:2.0.3 multimedia extensions: jakarta.activation:jakarta.activation-api:2.1.3 Jakarta Mail is hosted as an open source project on
Jakarta_EE
Specific software-based key for a computer program
A product key, also known as a software key, serial key or activation key, is a specific software-based key for a computer program. It certifies that the
Product_key
Protein of the immune system
GH (February 2008). "Activation of CXCR4 triggers ubiquitination and down-regulation of major histocompatibility complex class I (MHC-I) on epithelioid
MHC_class_I
Pleasurable phenomenon elicited via direct stimulation of specific brain regions
robust reward sensation due to a relatively direct activation of the reward circuitry. This activation is considered to be more direct than rewards produced
Brain_stimulation_reward
Nuclear receptor protein found in humans
transport, fatty acid binding and activation, and peroxisomal and mitochondrial fatty acid β-oxidation. Activation of fatty acid oxidation is facilitated
Peroxisome proliferator-activated receptor alpha
Peroxisome_proliferator-activated_receptor_alpha
Array of processing elements specialized for parallelizable workloads
programmed through a single mapping. The architecture of an individual processing element can then itself belong to any Flynn class. In particular, spatial
Spatial_architecture
Protein and coding gene in humans
PMID 3443095. Blin N, Yun J, Wess J (July 1995). "Mapping of single amino acid residues required for selective activation of Gq/11 by the m3 muscarinic acetylcholine
Muscarinic acetylcholine receptor M3
Muscarinic_acetylcholine_receptor_M3
antibodies recognize their epitope on the donor's HLA then complement activation occurs leads to cell lysis and death, allowing the cells to take up a
Tissue_typing
Protein family
p38 mitogen-activated protein kinases are a class of mitogen-activated protein kinases (MAPKs) that are responsive to stress stimuli, such as cytokines
P38 mitogen-activated protein kinases
P38_mitogen-activated_protein_kinases
Short chains of 2–50 amino acids
structural data, or a combination of both. Key molecular properties used for mapping include molecular weight, lipophilicity (logP and logD), topological polar
Peptide
2017.2.1 Caché ObjectScript (dynamic language), Basic. Java/.NET object mapping supported. SQL subset. Object notation allowed. Supports embedded SQL,
Comparison of object database management systems
Comparison_of_object_database_management_systems
Nuclear receptor protein found in humans
anti-inflammatory M2 macrophage activation in mice. Adiponectin induces ABCA1-mediated reverse cholesterol transport by activation of PPAR-γ and LXRα/β. Many
Peroxisome proliferator-activated receptor gamma
Peroxisome_proliferator-activated_receptor_gamma
Type of machine learning model
remain dormant until triggered by a specific event or condition. Upon activation, the LLM deviates from its expected behavior to make insecure actions
Large_language_model
Artificial intelligence control techniques
that a feedforward network with nonlinear, continuous and differentiable activation functions have universal approximation capability. Recurrent networks
Intelligent_control
Free online crowdsourced encyclopedia
by the Russian government. Bots on Wikipedia must be approved before activation. According to Andrew Lih, the current expansion of Wikipedia to millions
Wikipedia
Class of anti-diabetic and anti-obesity medication
agonists, GLP-1RAs, and informally as simply GLP-1s, are a class of medications that activate the GLP-1 receptor, causing reduced blood sugar, reduced appetite
GLP-1_receptor_agonist
Human protein and gene for T-cell signaling
(June 2001). "Mapping the Zap-70 phosphorylation sites on LAT (linker for activation of T cells) required for recruitment and activation of signalling
Linker for activation of T cells
Linker_for_activation_of_T_cells
Earthquake impacting Myanmar and Thailand
[Re-estimating the magnitude of 1839 Ava earthquake through geomorphic mapping and macroseismic records, central Myanmar] (Masters thesis). Department
2025_Myanmar_earthquake
Transcription factor scaffold domain
Gustafsson JA (Oct 2003). "Activation functions 1 and 2 of nuclear receptors: molecular strategies for transcriptional activation". Molecular Endocrinology
Transactivation_domain
Mobile GPS navigation app
(with the crowd-sourcing assistance of community users) a free digital mapping database of Israel compiled in the Hebrew language with ensured free content
Waze
Recurringly observed geometric pattern
and cobwebs map into lines in different directions. This means that if activation spreads in straight lines within the visual cortex, the experience is
Form_constant
Algorithm for modelling sequential data
vectors, and ϕ {\displaystyle \phi } is its activation function. The original transformer used ReLU activation. The number of neurons in the middle layer
Transformer_(deep_learning)
British passenger liner that sank in 1912
Titanic sustained damage. In May 2023, Magellan Ltd., a deep-water seabed-mapping company, announced that they had created a "digital twin" of the Titanic
Titanic
1989 novel by Dan Simmons
adult daughter had become an archaeologist and had gone to Hyperion. While mapping one of the Tombs, the Shrike appeared; Rachel contracted a disease that
Hyperion_(Simmons_novel)
Ongoing heatwaves throughout the European Union and surrounding countries
Retrieved 26 June 2026. "Extreme Heatwave Grips Europe in June 2026: Mapping the Peak Temperatures | Mappr". www.mappr.co. 22 June 2026. "TRT World
2026_European_heatwaves
In cognitive linguistics, relating conceptual domains
expressions of the form X is a Y (e.g. My job is a jail) may not activate conceptual mappings in the same way that other metaphoric expressions do. Furthermore
Conceptual_metaphor
Protein family
cancel out the activation signal of inflammation or cell activation which harm the tissues. Specifically, SHP1/2 down regulate the activating signaling pathways
Leukocyte immunoglobulin-like receptors
Leukocyte_immunoglobulin-like_receptors
American financier and child sex offender (1953–2019)
4, 2025. Jukes, Peter (September 12, 2025). "From Epstein to Starmer: Mapping Peter Thiel's Web of Influence in the UK". Byline Times. Archived from
Jeffrey_Epstein
Protein(s) forming a major part of an organism's immune system
Isotype or class switching is a biological process occurring after activation of the B cell, which allows the cell to produce different classes of antibody
Antibody
on which days. Return of April and first appearance of Angus 52 4 "Mole-Mapping" Becky Martin Jon Brown 2 December 2015 (2015-12-02) 1.26 Megan is angry
List_of_Peep_Show_episodes
Class of enzymes
Phospholipase C (PLC) is a class of membrane-associated enzymes that cleave phospholipids just before the phosphate group (see figure). It is most commonly
Phospholipase_C
Psychologist
revealed brain activation patterns for the passive viewing and lexical decision tasks. For passive viewing, there was greater activation for Chinese characters
Charles_Perfetti
Israeli military operation against Lebanon
2024. Retrieved 1 October 2024. Hussein, Mohammed (25 September 2024). "Mapping 10,000 cross-border attacks between Israel and Lebanon". Al Jazeera. Archived
2024_Lebanon_war
Group of neural structures responsible for motivation and desire
activate ERK through a different but interrelated Ras-Raf-MEK-ERK pathway. Alone NMDA mediated activation of ERK is self-limited, as NMDA activation also
Reward_system
Intravenous medication used in anesthesia
side effects is pain on injection, especially in smaller veins, due to activation of the sensory nerve pain receptor, TRPA1,. This can be mitigated by pretreatment
Propofol
Three-stranded nucleic acid structure
attack by endogenous mutagens, including DNA-modifying enzymes such as activation-induced cytidine deaminase, and can block replication forks to induce
R-loop
Object-oriented programming language
method activated in response to that message, but sends to super are looked up in the superclass of the method's defining class rather than the class of the
Smalltalk
Battery with solid electrodes and a solid electrolyte
cell. Lithium metal has a relatively low melting point of 453K and a low activation energy for self-diffusion of 50 kJ/mol, indicating its high propensity
Solid-state_battery
Mammalian protein found in Homo sapiens
its interaction with Janus kinase 1: the receptor is crucial for kinase activation". Biochem. J. 361 (Pt 1): 105–11. doi:10.1042/0264-6021:3610105. PMC 1222284
Janus_kinase_1
Member of a group of proteins that upregulate guanylate cyclase
(1998). "A mutation in guanylate cyclase activator 1A (GUCA1A) in an autosomal dominant cone dystrophy pedigree mapping to a new locus on chromosome 6p21.1"
Guanylate_cyclase_activator
Protein-coding gene in the species Homo sapiens
that in humans is encoded by the ALOX5AP gene. FLAP is necessary for the activation of 5-lipoxygenase and therefore for the production of leukotrienes,
5-lipoxygenase-activating protein
5-lipoxygenase-activating_protein
Aggressive type of brain cancer
investigations. The first pathway involves the amplification and mutational activation of receptor tyrosine kinase (RTK) genes, leading to the dysregulation
Glioblastoma
Mid-size luxury crossover SUV
addition of online services including Google POI search, Google Earth mapping, Street View, and traffic reporting. As part of the Touareg product launch
Volkswagen_Touareg
Protein-coding gene in the species Homo sapiens
Arg-115 of human class III alcohol dehydrogenase: a binding site required for formaldehyde dehydrogenase activity and fatty acid activation". Proc. Natl.
ADH5
Type of fox
2016. Belyaev, D. K.; Ruvinsky, A. O.; Trut, L. N. (1981). "Inherited activation-inactivation of the star gene in foxes: Its bearing on the problem of
Domesticated_silver_fox
Fictional character in the Overwatch franchise
appearance deviated from the expectations of omnic character designs. When mapping out the content for their hero shooter video game Overwatch, the developers
Shion_(Overwatch)
Genus of brown algae
Sargassum is a genus of brown macroalgae (seaweed) in the order Fucales of the class Phaeophyceae. This brown macroalgae comes from the Sargasso Sea, which was
Sargassum
2023 armed incursions and massacres in Israel
Wikipedia's sister projects Media from Commons Quotations from Wikiquote Mapping the massacres Ex-Israeli Defense Minister's Recollection of October 7,
October_7_attacks
Type of learning
Remembering one of the facts (or activation) will prime you to remember the others. This has been termed, Spreading activation. Learners who are able to use
Meaningful_learning
Protein-coding gene in the species Homo sapiens
STIM1 functions as a calcium sensor in the endoplasmic reticulum. Upon activation of the IP3 receptor, the calcium concentration in the endoplasmic reticulum
STIM1
Protein-coding gene in the species Homo sapiens
(2007). "NFX1-123 and poly(A) binding proteins synergistically augment activation of telomerase in human papillomavirus type 16 E6-expressing cells". J
NFX1
Controlling biological cells with light
how their phasic properties of activation relate to circuit function. To overcome these challenges, optogenetic activation has been combined with functional
Optogenetics
Autoimmune disease resulting in skeletal muscle weakness
addition of pathogenic antibodies against the acetylcholine receptor and activation of the complement system, the neuromuscular co-culture shows symptoms
Myasthenia_gravis
says PM Mikati". Al Jazeera. 25 October 2024. Retrieved 2 January 2025. "Mapping 11 months of Israel–Lebanon cross-border attacks". Al Jazeera. 11 September
Hezbollah–Israel conflict (2023–present)
Hezbollah–Israel_conflict_(2023–present)
3D Internet global map program
large databases of mapping data over the internet to client software, a key part of the technology, and acquired patchworks of mapping data from governments
Google_Earth
Class of artificial neural network
study the Hopfield network with binary activation functions. In a 1984 paper he extended this to continuous activation functions. It became a standard model
Recurrent_neural_network
Anti-government protests
Internet Shutdown". HRANA. 9 January 2026. Retrieved 10 January 2026. "Mapping the ongoing protests in Iran (UPDATED)". Faytuks Network. January 2026
2025–2026_Iranian_protests
Controlling component of a fire alarm system
effect", mapping is the process of activating outputs depending on which inputs have been activated. Traditionally, when an input device is activated, a certain
Fire_alarm_control_panel
Protein-coding gene in the species Homo sapiens, named for ketazocine
activation produces pain reversal and chronic stimulation leads to receptor tolerance and hyperalgesia with allodynia. Mechanisms such as activation of
Κ-opioid_receptor
Neurological condition involving the crossing of senses
experience of seeing color when looking at graphemes might be due to cross-activation of the grapheme-recognition area and the color area called V4 (see figure)
Synesthesia
S-shaped curve
generalisation of the logistic function to multiple inputs is the softmax activation function, used in multinomial logistic regression. Another application
Logistic_function
American unmanned aerial vehicle
hours later on a 16-hour mission to map the fire's perimeter. The fire mapping research is a joint project with NASA and the US Forest Service. The NASA
General_Atomics_MQ-9_Reaper
Structure at the rear of the vertebrate brain, beneath the cerebrum
rates much higher than 10 Hz) are reliably associated with climbing fiber activation, while simple spikes are produced by a combination of baseline activity
Cerebellum
2005 video game
capacity.[citation needed] An Ancestor-class fighter cruising around a bio-diverse planet (2005) Llama-class ship docks on mining station (2008) Lazer
Vega_Strike
Small family car
front seat heating, rear parking sensors, automatic headlight and wiper activation, cruise control, a Bluetooth mobile phone interface. S line Final Edition
Audi_A3
American full-size pickup built by Stellantis
option from the factory (it is activated by a dealership for a fee, however, does not include SiriusXM Travel Link or 3D mapping). The Uconnect ACCESS 8.4AN
Ram_pickup
Crewed full ocean depth rated submersible
of visiting the deepest points of all five of the world's oceans, and mapping the vicinity, by the end of September 2019. This expedition was filmed
DSV_Limiting_Factor
Protein-coding gene in the species Homo sapiens
Murakami Y, Pan ZQ, Hanaoka F (Jan 1998). "Mapping of the human genes encoding cyclin H (CCNH) and the CDK-activating kinase (CAK) assembly factor MAT1 (MNAT1)
Cyclin_H
Class of enzymes
to synaptic connections, especially within newborn animals which have activation of IP3R1. Should further research support the possible connection between
Calcineurin
2023 train collision in Greece, killing 57 people
unknown and controversial whether and how it was finally activated. Officially, the activation of the Plan is ordered by the Secretary General of Civil
Tempi_train_crash
Subtype of serotonin receptor
through biased agonism and G-protein activation. Here we present 8 new cryoEM structures covering all major compound classes for the 5HT2AR including a novel
5-HT2A_receptor
Protein-coding gene in humans
"The interaction of p62 with RIP links the atypical PKCs to NF-kappaB activation". The EMBO Journal. 18 (11): 3044–3053. doi:10.1093/emboj/18.11.3044.
Sequestosome_1
Discrete model of computation
configuration (preimage). If one thinks of a cellular automaton as a function mapping configurations to configurations, reversibility implies that this function
Cellular_automaton
Gene editing method
by fusing light-responsive protein partners with an activator domain and a dCas9 for gene activation, or by fusing similar light-responsive domains with
CRISPR_gene_editing
Ethnic cleansing of Palestinians
death and disease in Gaza". The Guardian. Retrieved 13 September 2024. "Mapping 1,800 Israeli settler attacks in the West Bank since October 2023". Al
Nakba
Enzyme found in humans
serine-threonine kinase domain. ULK1 also contains a phosphorylatable activation loop between the N and C lobes of the kinase domain. This region may regulate
ULK1
Ammonium nitrate explosion in Lebanon
McCann, Allison; Leatherby, Lauren; Migliozzi, Blacki (5 August 2020). "Mapping the Damage From the Beirut Explosion". The New York Times. ISSN 0362-4331
2020_Beirut_explosion
List of programming languages types and the languages that meet its description
form understandable by humans, although there may not be a one-to-one mapping between an individual statement and an individual instruction. Assembly
List of programming languages by type
List_of_programming_languages_by_type
Libyan molecular biologist
Alexandra L.; Niswander, Lee; Conlon, Ronald A. (2006). "Βeta-catenin activation is necessary and sufficient to specify the dorsal dermal fate in the mouse"
Sema_Sgaier
Calculating tool
T.H.; Hsieh, J.C.; Wui, Y.T.; Cheng, M.C.; Huang, Y.H. (2003). "Brain activation during abacus-based mental calculation with fMRI: A comparison between
Abacus
be one of the major activators of the inflammatory response and innate immunity. Having found that IKK dependent NF-κB activation suppresses programmed
Michael_Karin
Method of CPU communication
form of memory mapping to cause RAM or I/O hardware to appear in the 0xD000–0xDFFF range. Port-mapped I/O often uses a special class of CPU instructions
Memory-mapped I/O and port-mapped I/O
Memory-mapped_I/O_and_port-mapped_I/O
Victims of terror attacks in the US
May 28, 2011. "Casualties by Country — Memorial Mapping: Transnational 9/11 Memorials". Memorial Mapping: Transnational 9/11 Memorials. Archived from the
Casualties of the September 11 attacks
Casualties_of_the_September_11_attacks
Video-focused social media platform
Simões, Rita Basílio; Baeta, Agda Dias; Costa, Bruno Frutuoso (2023). "Mapping Feminist Politics on Tik Tok during the COVID-19 Pandemic: A Content Analysis
TikTok
Class of transport proteins
sensitive ChR2 and the yellow light-activated chloride pump halorhodopsin together enable multiple-color optical activation and silencing of neural activity
Channelrhodopsin
Ability of the brain to continuously change
strongly affects the auditory system, with musicians showing enhanced activation and structural differences in primary and secondary auditory cortices
Neuroplasticity
Modifier key on some computer keyboards
and punctuation marks. For example, when the US-International keyboard mapping is active, the C key can be used to insert four different characters: C
AltGr_key
Breakdown in empathy
perception–action-model of empathy, perception–action-coupling (i.e., the vicarious activation of the neural system for action during the perception of action) allows
Empathy_gap
CLASS ACTIVATION-MAPPING
CLASS ACTIVATION-MAPPING
Surname or Lastname
English and German
English and German : metonymic occupational name for a glazier or glass blower, from Old English glæs ‘glass’ (akin to Glad, referring originally to the bright shine of the material), Middle High German glas.Irish and Scottish : Anglicized form of the epithet glas ‘gray’, ‘green’, ‘blue’ or any of various Gaelic surnames derived from it.German : altered form of the personal name Klass, a reduced form of Nikolaus (see Nicholas).Jewish (Ashkenazic) : ornamental name from German Glass ‘glass’, or a metonymic occupational name for a glazier or glass blower.
Boy/Male
Australian, Danish, Dutch, Greek, Swedish
People of Victory; Victory of the People
Boy/Male
Greek Latin
People's victory.
Girl/Female
Tamil
Spandana | ஸà¯à®ªà®‚தநாÂ
Motivation, Responsible
Spandana | ஸà¯à®ªà®‚தநாÂ
Girl/Female
Indian
Glass
Boy/Male
Australian, Dutch, German, Greek
People's Victory
Surname or Lastname
English
English : variant of Close 1.German : variant of Kloss.
Surname or Lastname
English
English : from the medieval personal name Classe, a short form of Nicholas. See also Clayson.Variant of Klaas or Klass, North German forms of Claus.
Girl/Female
Muslim/Islamic
Glass
Girl/Female
Muslim
Glass
Surname or Lastname
North German
North German : topographic name from Middle Low German plas ‘place’, ‘open square’, ‘street’.South German (also Pläss) : from a short form of the medieval personal name Blasius.English : variant of Place 3.
Female
English
English short form of Latin Cassandra, CASS means "she who entangles men."Â
Boy/Male
Tamil
Spandhana | ஸà¯à®ªà®¨à¯à®¤à®¾à®¨à®¾Â
Motivation, Responsible
Spandhana | ஸà¯à®ªà®¨à¯à®¤à®¾à®¨à®¾Â
Surname or Lastname
English
English : nickname from Old French, Middle English cras ‘big’, ‘fat’ (Latin crassus).Possibly an altered spelling of German Krass.
Boy/Male
Hindu, Indian
Motivation
Girl/Female
Indian
Glass
Male
German
Short form of German Niclaus, CLAUS means "victor of the people."Â
Surname or Lastname
English
English : from the medieval female personal name Cass, a short form of Cassandra. This was the name (of uncertain, possibly non-Greek, origin) of an ill-fated Trojan prophetess of classical legend, condemned to foretell the future but never be believed; her story was well known and widely popular in medieval England.
Boy/Male
Hindu, Indian
Motivation
Girl/Female
Tamil
Glass
CLASS ACTIVATION-MAPPING
CLASS ACTIVATION-MAPPING
Boy/Male
Bengali, Indian
Lord Ram
Boy/Male
Arabic
Precious; Talented
Surname or Lastname
English
English : topographic name for someone who lived on or near a hill, Middle English mount (from Old English munt, reinforced by Old French mont).Scottish : probably a habitational name from places so called in Peeblesshire, Fife, and Lanarkshire.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Lord Vishnu
Girl/Female
Hindu
Radha or successful or lover of Lord Krishna
Boy/Male
Arabic, Muslim
Honest
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Tamil, Telugu, Traditional
Parvati; One who Lives in the Mountain
Girl/Female
Irish
Bard.
Female
Hebrew
(× Ö´×¡Ö¸×”) Variant spelling of Hebrew Nisa, NISSA means "to test."
Girl/Female
Indian
Ornaments; Deep
CLASS ACTIVATION-MAPPING
CLASS ACTIVATION-MAPPING
CLASS ACTIVATION-MAPPING
CLASS ACTIVATION-MAPPING
CLASS ACTIVATION-MAPPING
v. t.
A drinking vessel; a tumbler; a goblet; hence, the contents of such a vessel; especially; spirituous liquors; as, he took a glass at dinner.
n.
One of the sections into which a church or congregation is divided, and which is under the supervision of a class leader.
v. t.
To smooth or polish anything, as leater, by rubbing it with a glass burnisher.
n.
Aestivation.
n.
Alt. of Estivation
n.
To arrange in classes; to classify or refer to some class; as, to class words or passages.
v. t.
To case in glass.
v. t.
An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses.
v. t.
Variant of Clasp
n.
A group of individuals ranked together as possessing common characteristics; as, the different classes of society; the educated class; the lower classes.
n.
To divide into classes, as students; to form into, or place in, a class or classes.
v. t.
To shut or fasten together with, or as with, a clasp; to shut or fasten (a clasp, or that which fastens with a clasp).
v. t.
A looking-glass; a mirror.
v. t.
Anything made of glass.
a.
Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope.
v. t.
To cover or furnish with glass; to glaze.
n.
Alt. of Estivation
a.
Of the rank or degree below the best highest; inferior; second-rate; as, a second-class house; a second-class passage.