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Ratio of regional to local species diversity in ecology
In ecology, beta diversity (β-diversity or true beta diversity) is the ratio between regional and local species diversity. The term was introduced by
Beta_diversity
Diversity of species at a local scale
beta diversity (β-diversity) and gamma diversity (γ-diversity). Whittaker's idea was that the total species diversity in a landscape (gamma diversity)
Alpha_diversity
How many different types are in a dataset
of the true diversity of order infinity (1/∞D). Alpha diversity Beta diversity Cultural diversity Effective number of parties, a diversity index applied
Diversity_index
Number of distinct species in a biological community
Alpha diversity Beta diversity Biodiversity Diversity index Measurement of biodiversity Biotic homogenization Coexistence theory Dark diversity Gamma
Species_diversity
Total species diversity in a landscape
with the terms alpha diversity (α-diversity) and beta diversity (β-diversity). Whittaker's idea was that the total species diversity in a landscape (γ)
Gamma_diversity
Cohort succeeding Generation Alpha
have a stronger appreciation for diversity than previous generations. It is expected that many members of Generation Beta will live to see the 22nd century
Generation_Beta
American ecologist (1920–1980)
and precipitation. He proposed the concepts of Alpha diversity, Beta diversity, and Gamma diversity. Whittaker was elected to the National Academy of Sciences
Robert_Whittaker_(ecologist)
may be genetic, taxonomic, or functional, and it leads to a loss of beta (β) diversity. While the term is sometimes used interchangeably with "taxonomic
Biotic_homogenization
Ecological concept
dark diversity and beta diversity. If beta diversity is the association between alpha and gamma diversity, dark diversity connects alpha diversity and
Dark_diversity
Organism that eats mostly or exclusively plant material
there is evidence of phylogenetic linkage between plant beta diversity and phylogenetic beta diversity of insect clades such as butterflies. These types of
Herbivore
Variety and variability of life forms
to increase local (alpha diversity) diversity, which decreases turnover of diversity (beta diversity). Overall gamma diversity may be lowered because species
Biodiversity
Measure of biodiversity
basis. In the ζ-diversity framework this can be described as ζ1, the number of unique taxa present in one sample. Beta diversity (β-diversity) is a measure
Zeta_diversity
Eukaryotes other than animals, plants or fungi
characterized by a higher beta diversity (highly heterogeneous between samples) than soil and marine plankton. The high diversity can be a result of the
Protist
Organisms that live at the surface of a body of water
"A diversity of beta diversities: Straightening up a concept gone awry. Part 1. Defining beta diversity as a function of alpha and gamma diversity". Ecography
Neuston
Probability distribution
^{2}(2\beta -1)+\beta ^{2}(\beta +1)-2\alpha \beta (\beta +2)]}{\alpha \beta (\alpha +\beta +2)(\alpha +\beta +3)}}\\&={\frac {6[(\alpha -\beta )^{2}(\alpha
Beta_distribution
Extinct genus of damselflies
latitude high alpha diversity resulting from climatic equitability during the Early Eocene in combination with resultant beta diversity between sites due
Okanagrion
Technique to assess species richness
when no taxon is extremely rare or common[citation needed], or when beta diversity is very high. Rarefaction assumes that the number of occurrences of
Rarefaction_(ecology)
Biome
restricted to tropical dry forests, particularly in plants; beta diversity and alpha diversity high but typically lower than adjacent moist forests. Effective
Tropical and subtropical dry broadleaf forests
Tropical_and_subtropical_dry_broadleaf_forests
Japanese island chain
boundary, the Watase Line (Tokara Gap), revealed by bibliographic and beta diversity analysis". bioRxiv 10.1101/186775. "Nature in Japan; 2-1) Topography;
Ryukyu_Islands
Evolutionary radiation of marine animal life throughout the Ordovician period
Tremadocian. From the Floian onward, alpha diversity dethroned beta diversity as the greater contributor to regional diversity patterns. In addition to a diversification
Great Ordovician Biodiversification Event
Great_Ordovician_Biodiversification_Event
Native animals of South America
systems have revealed that alpha diversity (species diversity within a specific habitat or ecosystem) and beta diversity (variation in species composition
Fauna_of_South_America
Second period of the Paleozoic Era
cosmopolitan distribution, with less diversity on different continents. During the Middle Ordovician, beta diversity began a significant decline as marine
Ordovician
Portugal showed that the primary factor in beta diversity was a broad-scale gradient of mediterraneity. Diversity was lower in the northern dunes, which are
Mediterranean Biogeographic Region
Mediterranean_Biogeographic_Region
Species of flowering plant
Beta vulgaris (beet) is a species of flowering plant in the subfamily Betoideae of the family Amaranthaceae. It is a perennial plant usually growing up
Beta_vulgaris
American Latino collegiate sorority
Latino Fraternal Organizations (NALFO). Omega Phi Beta's ideals or pillars are sisterhood, diversity, leadership, service, and academic excellence. The
Omega_Phi_Beta
Subtropical ecoregion in Brazi
last investigated. High levels of endemism can also be identified by beta diversity analyses, which measure differentiation levels between two areas. A
Campos_rupestres
Protected area in Costa Rica
Ciecka, Anna L.; Meyer, Nola Y.; Rabenold, Kerry N. (March 2009). "Beta diversity along environmental gradients: implications of habitat specialization
Children's_Eternal_Rainforest
Parasitic fungus that only lives on lichen
various fungal species. Alpha diversity (diversity within subplots) was found to be higher than beta diversity (diversity within plots), indicating substantial
Lichenicolous_fungus
Volcanic hotspot in the United States
it increased ecological beta diversity locally by fragmenting previously connected habitats and increasing topographic diversity in western North America
Yellowstone_hotspot
Historically African American sorority
backlash the sorority eventually issued a "diversity statement" changing its stance on transgender women. Zeta Phi Beta is the only National Pan-Hellenic Council
Zeta_Phi_Beta
Species of plant
Tappeiner, Ulrike; Seeber, Julia (2020-07-27). "Species richness and beta diversity patterns of multiple taxa along an elevational gradient in pastured
Alysicarpus_glumaceus
Subarctic terrestrial ecozone
I-Fang (September 2018). "Spatial scale changes the relationship between beta diversity, species richness and latitude". Royal Society Open Science. 5 (9) 181168
Boreal_ecosystem
Wikimedia list
alpha diversity The average species diversity of sites or habitats at a local scale. Alpha diversity combined with beta diversity yields gamma diversity. animal
Glossary_of_ecology
Empirical measurement
the number of taxa within the ecosystem (usually species) Beta diversity is species diversity between ecosystems; this involves comparing the number of
Measurement_of_biodiversity
(2019). "A Differently dispersing organism groups show contrasting beta diversity patterns in a dammed subtropical river basin". Science of the Total
History_of_dams
Phi Beta Sigma is a historically African American fraternity that was founded at Howard University in Washington, D.C. in 1914. The fraternity's membership
List of Phi Beta Sigma members
List_of_Phi_Beta_Sigma_members
Class of enzymes
Beta-lactamases (β-lactamases) are enzymes (EC 3.5.2.6) produced by bacteria that provide multi-resistance to beta-lactam antibiotics such as penicillins
Beta-lactamase
Communications technology technique
Cooperative diversity is a cooperative multiple antenna technique for improving or maximising total network channel capacities for any given set of bandwidths
Cooperative_diversity
Order of amphibians
Chris; Novotny, Vojtech; Moravec, Jiri; Richards, Stephen J. (2009). "Beta diversity of frogs in the forests of New Guinea, Amazonia and Europe: contrasting
Frog
American team leader and senior scientist
community assembly processes from a phylogenetic approach to quantifying beta diversity. Her research is important for predicting how ecosystems may respond
Catherine_H._Graham
Type of agriculture that emphasizes natural and environmentally friendly techniques
Doreen; Roschewitz, Indra; Tscharntke, Teja; Thies, Carsten (2006). "Beta Diversity at Different Spatial Scales: Plant Communities in Organic and Conventional
Organic_farming
National park in Honduras
exceptional species richness. Cusuco also has great diversity of habitats and high beta diversity in many groups due to the large elevational gradients
Cusuco_National_Park
Wood sunk to the sea floor
PMC 3534711. PMID 23301092. McClain, Craig; Barry, James (2014-04-09). "Beta-diversity on deep-sea wood falls reflects gradients in energy availability". Biology
Deep-sea_wood
Species of gastropod
Paleobiogeography: Consideration of latitudinal gradients, provincialism and beta diversity (Unpublished taxonomic opinions). Turton, W. (1819) A Conchological
Aclis_ascaris
National park in Portugal
Henrique M.; Corley, Martin F. V.; Merckx, Thomas (December 2019). "Beta diversity patterns reveal positive effects of farmland abandonment on moth communities"
Peneda-Gerês_National_Park
Genus of algae
W.F.; Stokvis, F.R.; Speksnijder, A.G.C.L.; Hoeksema, B.W. (2017). "Beta diversity of macroalgal communities around St. Eustatius, Dutch Caribbean". Marine
Struvea
Second brightest star in the southern constellation of Pictor
Beta Pictoris (abbreviated β Pictoris or β Pic) is the second brightest star in the constellation Pictor. It is located 63.4 light-years (19.4 pc) from
Beta_Pictoris
Tribe of butterflies in the subfamily Danainae
biological diversity within neotropical forests, but individual sites harbor between 10 and 50 species, for the most part, and beta diversity is often great
Ithomiini
Ellenberg indicator values for relevés, various indices of alpha and beta diversity classification of relevés using TWINSPAN or cluster analysis expert
JUICE_(software)
Danish ecologist, biogeographer and academic
complex, with trait diversity in tree assemblages showing patterns consistent with environmental filtering theory at the alpha and beta scales, but no consistent
Jens-Christian_Svenning
Nature Preserve — Bank of Natural Capital — Beta diversity — BioBlitz — Biocomplexity — Biocultural diversity — Biodiversity action plan — Biodiversity
Index of biodiversity articles
Index_of_biodiversity_articles
Rhea
Normalization of the OTU table Calculation of the alpha diversity for each sample Calculation of beta diversity and visualization of the results with PCoA Taxonomic
Rhea_(pipeline)
Natural reserve in Zhejiang, China
; Ren, H.; Ma, K.; Yu, M.; Sun, I. F.; He, F. (2009). "Partitioning beta diversity in a subtropical broad-leaved forest of China". Ecology. 90 (3): 663–674
Gutianshan National Nature Reserve
Gutianshan_National_Nature_Reserve
Canadian paleobiologist
Precipitation Explains Spatiotemporal Patterns of Cenozoic Mammal Beta Diversity and Latitudinal Diversity Gradients in North America." PLoS ONE 9.9 (2014): e106499
Natalia_Rybczynski
Canadian ecologist
Fields Numerical ecology Community ecology Multivariate statistics Beta diversity Spatial analysis Statistical methods Institutions Université du Québec
Pierre_Legendre_(ecologist)
Organic fertilizer made from seaweed
fermented seaweed fertilizer, showed a large shift in alpha diversity and beta diversity indices between untreated soils and soils after 60 days. This
Seaweed_fertiliser
Genetic technique for identifying organisms in mixed samples
methods for full ecological study. eDNA metabarcoding has applications to diversity monitoring across all habitats and taxonomic groups, ancient ecosystem
Metabarcoding
Distance metric used for comparing biological communities
M; Kelley, S. T.; Knight, R. (2007). "Quantitative and qualitative beta diversity measures lead to different insights into factors that structure microbial
UniFrac
Species of plant
of Mexican beech forests (Fagus mexicana: Fagaceae) in Tamaulipas: beta diversity and bioclimatic analysis in Mexico". Botanical Journal of the Linnean
Ternstroemia_sylvatica
American fraternal organization
Zeta Beta Tau (ΖΒΤ) is a Greek-letter social fraternity based in North America. It was founded in 1898 at City College of New York. Originally a Zionist
Zeta_Beta_Tau
Maximum, and of a relationship between those changes and pattern of beta diversity of the studied flora, is presented Xu et al. (2025). El-Saadawi et al
2025_in_paleobotany
Family of transport proteins
of large alpha subunits that associate with accessory proteins, such as beta subunits. An alpha subunit forms the core of the channel and is functional
Voltage-gated_sodium_channel
Process of population movement to cities
hdl:10138/315037. Liao, W.; Soininen, J. (2025). "Temporal alpha and beta diversity of diving beetles (Coleoptera: Dytiscidae) reveals biotic heterogenisation
Urbanization
The universality–diversity paradigm (UDP) is the analysis of biological materials based on the universality and diversity of its fundamental structural
Universality–diversity paradigm
Universality–diversity_paradigm
Long-term oceanographic study based at the University of Hawaii at Manoa
irradiance with alpha and beta diversity respectively. Possible mechanisms for how wind speeds affect microbial alpha diversity has not been fully determined
Hawaii_Ocean_Time-series
Species of moth
Walker comb. n." The Moths of Borneo. Retrieved 12 November 2018. "Low beta diversity of herbivorous insects in tropical forests" (PDF). Nature. Retrieved
Nycteola_indicatana
Body of liquid water that flows down a channel formed by a glacier
population. Moreover, in similar latitude and altitude glacial stream, the beta diversity is similar and enhanced compared to non-glacial reaches. Alpine streams
Glacial_stream
Kenyan ichthyologist
Woods, T., & Nyingi, D. W. (2022). Drivers of species richness and beta diversity of fishes in an Afrotropical intermittent river system. Ecology and
Dorothy_Wanja_Nyingi
Longest-running Mars analog habitat
(2011-07-01). "A wide variety of putative extremophiles and large beta-diversity at the Mars Desert Research Station (Utah)". International Journal of
Mars_Desert_Research_Station
International collegiate fraternity
national fraternities merged with Pi Lambda Phi: Phi Beta Delta, Beta Sigma Tau and Beta Sigma Rho. Phi Beta Delta was founded at Columbia University, April
Pi_Lambda_Phi
American multicultural collegiate fraternity
positive image of diversity. Sigma Beta Rho was a founding member of the National APIDA Panhellenic Association (NAPA). Sigma Beta Rho member Akash Kuruvilla
Sigma_Beta_Rho
S.B.; Greenwood, D.R.; Mathewes, R.W. (2013). "Seasonality, montane beta diversity, and Eocene insects: Testing Janzen's dispersal hypothesis in an equable
Paleobiota of the Klondike Mountain Formation
Paleobiota_of_the_Klondike_Mountain_Formation
DNA sampled from the environment rather than directly from an individual organism
Boetius, Antje; Ramette, Alban (2011). "Global Patterns of Bacterial Beta-Diversity in Seafloor and Seawater Ecosystems". PLOS ONE. 6 (9) e24570. Bibcode:2011PLoSO
Environmental_DNA
Order of single-celled organisms
Stoeck T, Dunthorn M (2018). "Consistent patterns of high alpha and low beta diversity in tropical parasitic and free-living protists". Molecular Ecology.
Vampyrellida
Volcano in Jujuy Province, Argentina
E.; Rodríguez, José S.; Grau, Héctor R. (26 June 2017). "Modelling beta diversity of aquatic macroinvertebrates in High Andean wetlands". Journal of Limnology
Tocomar
Species of bird
Camilo E.; Vélez, Catalina; Ramírez, Laura; Celis, Marcela (2019). "Beta diversity and knowledge gaps of Colombia's dry forests: implications for their
Colombian_chachalaca
Mammalian protein found in Homo sapiens
Hemoglobin subunit beta (beta globin, β-globin, haemoglobin beta, hemoglobin beta) is a globin protein, coded for by the HBB gene, which along with alpha
Hemoglobin_subunit_beta
Native American collegiate fraternity
5, 2024 – via Newspapers.com. "Beta Sigma Epsilon-HSU Delta Chapter". Facebook. Retrieved October 5, 2024. "Diversity Resource Guide - Native American
Beta_Sigma_Epsilon
American Author, Paleontologist and Science Communicator
climate change differentially drive Pliocene and Pleistocene mammalian beta diversity of the Great Basin and Great Plains provinces of North America". Evolutionary
Amy_Atwater
Family of beetles
hdl:10138/342331. Liao, W.; Soininen, J. (2025). "Temporal alpha and beta diversity of diving beetles (Coleoptera: Dytiscidae) reveals biotic heterogenisation
Dytiscidae
the opposite is true for larger species. Larger species have lower beta diversity and are replaced less frequently across landscapes and as a result tend
Body size and species richness
Body_size_and_species_richness
Bolivian ethnobotanist
Araujo-Murakami, Alejandro; Paniagua-Zambrana, Narel; Seidel, Renate (2013). "Beta-diversity in temperate and tropical forests reflects dissimilar mechanisms of
Narel_Y._Paniagua-Zambrana
Super Jupiter orbiting Beta Pictoris
Beta Pictoris b (abbreviated as β Pic b) is an exoplanet orbiting the young debris disk, A-type main sequence star, Beta Pictoris located approximately
Beta_Pictoris_b
Protein family
channel beta subunit is a family of proteins comprising the beta subunits of calcium-activated potassium channels. The functional diversity of potassium
Calcium-activated potassium channel beta subunit
Calcium-activated_potassium_channel_beta_subunit
strictosidine glucosidase, an enzyme initiating biosynthetic pathways to a unique diversity of indole alkaloid skeletons". Biochimica et Biophysica Acta (BBA) - Proteins
Strictosidine beta-glucosidase
Strictosidine_beta-glucosidase
Species of gastropod
Trinchesia beta is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae. This species was described from
Trinchesia_beta
City important to the world economy
create the GaWC's biennial categorization of world cities into "Alpha", "Beta", and "Gamma" tiers. The three tiers are further divided into subgroupings
Global_city
Genus of seaweeds
populations supported higher functional, taxonomic and phylogenetic microbial beta diversity than non-disturbed populations. It was hypothesised that this change
Durvillaea
Phenomenon in materials science
alpha-melibiose was available. Beta-melibiose is in fact an epimer of alpha-melibiose. However, since when in solution, alpha- and beta-melibiose rapidly convert
Disappearing_polymorph
Species of fish native to Thailand
single-versus-multiple origin of mouthbrooding; the state of cryptic diversity and evolutionary forces driving speciation in the betta lineage; responsive
Siamese_fighting_fish
Super Jupiter exoplanet orbiting Beta Pictoris
Beta Pictoris c (abbreviated as β Pic c) is the second exoplanet discovered orbiting the young star Beta Pictoris, located approximately 63 light-years
Beta_Pictoris_c
481,000 Topics: Oscars (host Chris Rock's address regarding lack of diversity in nominations as well as Mad Max: Fury Road's six wins); Coalition senators
List of The Weekly with Charlie Pickering episodes
List_of_The_Weekly_with_Charlie_Pickering_episodes
PMID 18467455. Agger S, Lopez-Gallego F, Schmidt-Dannert C (June 2009). "Diversity of sesquiterpene synthases in the basidiomycete Coprinus cinereus". Molecular
Beta-cubebene_synthase
Free online crowdsourced encyclopedia
CirrusSearch which is based on Elasticsearch. In July 2013, after extensive beta testing, a WYSIWYG (What You See Is What You Get) extension, VisualEditor
Wikipedia
S.B.; Greenwood, D.R.; Mathewes, R.W. (2013). "Seasonality, montane beta diversity, and Eocene insects: Testing Janzen's dispersal hypothesis in an equable
Paleofauna of the Eocene Okanagan Highlands
Paleofauna_of_the_Eocene_Okanagan_Highlands
physicist Ernest Rutherford discovered two types of radiation, alpha and beta rays, which were less penetrating than X-rays. In 1903, he linked these rays
History of France's civil nuclear program
History_of_France's_civil_nuclear_program
Bibcode:2010ApEnM..76.7723L. doi:10.1128/aem.01811-10. PMC 2988597. PMID 20889795. Beta-copaene+synthase at the U.S. National Library of Medicine Medical Subject
Beta-copaene_synthase
Fossil bed in the Interior of British Columbia
S.B.; Greenwood, D.R.; Mathewes, R.W. (2013). "Seasonality, montane beta diversity, and Eocene insects: Testing Janzen's dispersal hypothesis in an equable
McAbee_Fossil_Beds
Class of enzymes
with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, beta-seco-amyrin-forming). This enzyme catalyses the following chemical reaction
Beta-seco-amyrin_synthase
Chatbot developed by xAI
early beta, it would only be available to higher tier X Premium subscribers. At the time of the preview, xAI described the chatbot as "a very early beta product
Grok_(chatbot)
BETA DIVERSITY
BETA DIVERSITY
Female
Native American
 Native American Blackfoot name PETA means "golden eagle." Compare with another form of Peta.
Female
English
English name derived from the second letter of the Greek alphabet, beta, related to Hebrew bet, BETA means "house."Â
Biblical
Beth (Hebrew)|house of the sun
Boy/Male
Scottish Shakespearean
Son of Beth.
Boy/Male
Bengali, Hindu, Indian, Sanskrit
Heart Beat
Female
English
Short form of English Beatrix, BEA means "voyager (through life)."Â
Female
Spanish
 Short form of Spanish Aleta, LETA means "winged." Compare with another form of Leta.
Female
Italian
 Variant spelling of Italian Zita, ZETA means "little girl." Compare with another form of Zeta.
Girl/Female
Greek Hebrew English
From the Hebrew Elisheba, meaning either oath of God, or God is satisfaction. Famous bearer: Old...
Male
Hebrew
(בֶּלַע) Hebrew name BELA means "destruction." In the bible, this is the name of several characters, including a king of Edom.
Female
Hungarian
Hungarian form of Greek Elisabet, ERZSÉBET means "God is my oath."
Female
German
Short form of German Margarete, META means "pearl."
Female
Polish
Polish name derived from Latin beatus, BEATA means "blessed."Â
Girl/Female
Indian, Marathi
Our Heart Beat
Boy/Male
Hindu, Indian, Sanskrit
Emperor; Single Beat
Female
Polish
Polish form of Greek Elisabet, ELŻBIETA means "God is my oath."
Female
English
Short form of English Elizabeth, BET means "God is my oath."Â
Female
English
Czech and Polish form of German Bertha, BERTA means "bright."
Female
Hebrew
(× Ö¶×˜Ö·×¢) Hebrew unisex name NETA means meaning "plant, shrub."
Female
English
Short form of English Elizabeth, BETH means "God is my oath."Â
BETA DIVERSITY
BETA DIVERSITY
Boy/Male
Arabic, Chinese, Indian, Iranian, Muslim, Parsi, Pashtun
Prince; White Falcon; King of Falcons; Royal Falcon
Boy/Male
Australian, Portuguese
Free Man; Masculine
Girl/Female
Muslim
Happy. Lucky.
Boy/Male
Australian, Italian, Portuguese
Spear
Boy/Male
Tamil
Pritish | பà¯à®°à¯€à®¤à¯€à®·
God of Love, Lord of the world
Male
English
Anglicized form of Gaelic Alaster, ALLASTIR means "defender of mankind."
Boy/Male
Hebrew Biblical
Gathers.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Tamil
Pious
Female
Egyptian
, the wife of the god Mentu.
Boy/Male
Hindu
King of snake
BETA DIVERSITY
BETA DIVERSITY
BETA DIVERSITY
BETA DIVERSITY
BETA DIVERSITY
n.
A sudden swelling or reenforcement of a sound, recurring at regular intervals, and produced by the interference of sound waves of slightly different periods of vibrations; applied also, by analogy, to other kinds of wave motions; the pulsation or throbbing produced by the vibrating together of two tones not quite in unison. See Beat, v. i., 8.
n.
A recurring stroke; a throb; a pulsation; as, a beat of the heart; the beat of the pulse.
v. t.
To beat.
v. t.
To beat severely.
v. i.
A cheat or swindler of the lowest grade; -- often emphasized by dead; as, a dead beat.
p. p.
of Beat
v. t.
To beat thoroughly or severely.
v. i.
To make a succession of strokes on a drum; as, the drummers beat to call soldiers to their quarters.
v. i.
A round or course which is frequently gone over; as, a watchman's beat.
v. t.
That on which bets are laid; the subject of a bet.
imp. & p. p.
of Bet
v. t.
To strike repeatedly; to lay repeated blows upon; as, to beat one's breast; to beat iron so as to shape it; to beat grain, in order to force out the seeds; to beat eggs and sugar; to beat a drum.
imp.
of Beat
v. t.
To give the signal for, by beat of drum; to sound by beat of drum; as, to beat an alarm, a charge, a parley, a retreat; to beat the general, the reveille, the tattoo. See Alarm, Charge, Parley, etc.
n.
The common beet (Beta vulgaris).
v. i.
To make a sound when struck; as, the drums beat.
n.
The rise or fall of the hand or foot, marking the divisions of time; a division of the measure so marked. In the rhythm of music the beat is the unit.
pl.
of Seta