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Linguistics concept
In linguistics, an empty category, which may also be referred to as a covert category, is an element in the study of syntax that does not have any phonological
Empty_category
Category whose objects are small categories and whose morphisms are functors
categories. Cat may actually be regarded as a 2-category with natural transformations serving as 2-morphisms. The initial object of Cat is the empty category
Category_of_small_categories
In linguistics, the empty category principle (ECP) was proposed in Noam Chomsky's syntactic framework of government and binding theory. The ECP is supposed
Empty_category_principle
Result from multiplying no factors
category with n objects. An empty product is then given by the limit with respect to the empty category, which is the terminal object of the category
Empty_product
Category of non-empty finite ordinals and order-preserving maps
mathematics, the simplex category (or simplicial category or nonempty finite ordinal category) is the category of non-empty finite ordinals and order-preserving
Simplex_category
Mathematical set containing no elements
{\displaystyle A,} the empty function. As a result, the empty set is the unique initial object of the category of sets and functions. The empty set can be turned
Empty_set
Mathematical concept
is the empty category there is only one diagram of shape J: the empty one (similar to the empty function in set theory). A cone to the empty diagram
Limit_(category_theory)
Special objects used in (mathematical) category theory
The empty set is the unique initial object in Set, the category of sets. Every one-element set (singleton) is a terminal object in this category; there
Initial_and_terminal_objects
Classification of a land vehicle for regulatory purposes
mass of empty vehicle not exceeding 350 kg) Category LC: motorcycles (two-wheeled, with one or more parameters exceeding the LA category) Category LD: motorcycles
Vehicle_category
Property of items within the grammar of a language
linguistics, a grammatical category or grammatical feature is a property of items within the grammar of a language. Within each category there are two or more
Grammatical_category
General theory of mathematical structures
objects have in common, such as the empty set or the product of two topologies, yet in the definition of a category, objects are considered atomic, i.e
Category_theory
Semigroup containing no elements
out the empty semigroup as a monoid. In category theory, the empty semigroup is always admitted. It is the unique initial object of the category of semigroups
Empty_semigroup
Construction in category theory
interesting example takes J to be a span. J can also be taken to be the empty category, leading to the simplest cones. Let N be an object of C. A cone from
Cone_(category_theory)
Word classes, largely corresponding to traditional parts of speech
fairly recent and still ongoing. Dependency grammar Empty category Grammatical category Lexical category (part of speech) Merge (linguistics) Phrase Phrase
Syntactic_category
Topics referred to by the same term
Category 0 can refer to: Empty category 0, the category of no objects and no morphisms, is the initial object of the category of small categories is the
Category_0
Category whose objects are sets and whose morphisms are functions
In the mathematical field of category theory, the category of sets, denoted by Set, is the category whose objects are sets. The arrows or morphisms between
Category_of_sets
Type of category in category theory
In mathematics, specifically in category theory, an additive category is a preadditive category admitting all finitary biproducts. There are two equivalent
Additive_category
Generalization of a category
specifically category theory, a quasi-category (also called quasicategory, weak Kan complex, inner Kan complex, infinity category, ∞-category, Boardman complex
Quasi-category
category J is connected if each functor from J to a discrete category is constant. In some cases it is convenient to not consider the empty category to
Connected_category
Category whose objects are rings and whose morphisms are ring homomorphisms
divide that of R. Note that even though some of the hom-sets are empty, the category Ring is still connected since it has an initial object. Some special
Category_of_rings
Concept in topology
if countable unions of closed sets with empty interior also have empty interior. According to the Baire category theorem, compact Hausdorff spaces and complete
Baire_space
American television sitcom (1988–1995)
Empty Nest is an American television sitcom that aired for seven seasons on NBC from October 8, 1988, to June 17, 1995. The series, which was created
Empty_Nest
S2CID 236395026. Edman, Jesper; Ahmadjian, Christina L. (2017-03-24). "Empty Categories and Industry Emergence: The Rise and Fall of Japanese Ji-biru". In
Category_design
{\displaystyle J^{\mathrm {op} }} is filtered. In detail, a category is cofiltered when it is not empty, for every two objects j {\displaystyle j} and j ′ {\displaystyle
Filtered_category
Category admitting tensor products
In mathematics, a monoidal category (or tensor category) is a category C {\displaystyle \mathbf {C} } equipped with a bifunctor ⊗ : C × C → C {\displaystyle
Monoidal_category
English actor, memoirist and novelist (1910–1983)
for which he holds the record of shortest winning performance in that category (at 23 minutes and 39 seconds). His other notable films during this time
David_Niven
Construction for categories
with the empty category as unit element makes the category of small categories C a t {\displaystyle \mathbf {Cat} } into a monoidal category. For a small
Join_(category_theory)
American linguist (1942–2023)
wrote an article on the importance of identifying empty categories in sentence processing. Empty categories can “account for certain regularities of sentence
Janet_Dean_Fodor
1968 book by Peter Brook
The Empty Space is a 1968 book by the British director Peter Brook examining four modes or points of view on theatre: Deadly; Holy; Rough; and Immediate
The_Empty_Space
Type of category in category theory
In category theory, a category is Cartesian closed if, roughly speaking, any morphism defined on a product of two objects can be naturally identified
Cartesian_closed_category
Category with direct sums and certain types of kernels and cokernels
1.2.6, it is required that an additive category have a zero object (empty biproduct). An additive category is preabelian if every morphism has both
Abelian_category
Category-theoretic construction
In category theory, the coproduct, or categorical sum, is a construction which includes as examples the disjoint union of sets and of topological spaces
Coproduct
{\displaystyle V} of the quiver, there is an "empty path" which constitutes the identity morphisms of the category. The composition operation is concatenation
Free_category
Family of single-engined, single seat aircraft
Reliant designs are intended to have empty weights under 254 lb (115 kg), and fit into the US ultralight category. The remaining designs are heavier and
Hipp's_Superbirds_J-3_Kitten
Concept in category theory
Fibred categories (or fibered categories) are abstract entities in mathematics used to provide a general framework for descent theory. They formalise
Fibred_category
Right inverse of a morphism
In category theory, a branch of mathematics, a section is a right inverse of some morphism. Dually, a retraction is a left inverse of some morphism. In
Section_(category_theory)
Void between celestial bodies
universe, but even galaxies and star systems consist almost entirely of empty space. Most of the remaining mass-energy in the observable universe is made
Outer_space
Mathematical category with weak equivalences, fibrations and cofibrations
In mathematics, particularly in homotopy theory, a model category is a category with distinguished classes of morphisms ('arrows') called 'weak equivalences'
Model_category
Generalized object in category theory
example: An empty product (that is, I {\displaystyle I} is the empty set) is the same as a terminal object, and some categories, such as the category of infinite
Product_(category_theory)
Chicago music venue and bar
Empty Bottle is a bar and music venue located at 1035 N. Western Avenue in Chicago, Illinois. Located on the west side of Chicago's Ukrainian Village
Empty_Bottle
2025 documentary short film by Joshua Seftel
the Empty Rooms' examines the bedrooms of children killed in school shootings – MPR News on YouTube "98th Oscars Shortlists in 12 Award Categories Announced"
All_the_Empty_Rooms
Mathematical construction in category theory
has one element or is empty, has a partially ordered set as a skeleton. There many examples of skeletonization of fusion categories and related structures
Skeleton_(category_theory)
"Small" subset of a topological space
set or a set of first category) is a subset of a topological space that is a countable union of subsets whose closures have empty interior. Thus meager
Meagre_set
Chinese strategy
The Empty Fort Strategy involves using reverse psychology to deceive the enemy into thinking that an empty location is full of traps and ambushes, and
Empty_Fort_Strategy
categories such as auxiliary verbs (INFL), phrasal categories such as relative clauses (SRel) and empty categories such as wh-traces (tWH).US patent 10133724
Symbolic linguistic representation
Symbolic_linguistic_representation
Algebraic structure with only one element
the category of pseudo-rings, the category of modules and the category of vector spaces. However, the zero ring is not a zero object in the category of
Zero_object_(algebra)
Men's national association football team representing Curaçao
s-germany-no-disgrace. Retrieved 17 June 2026. {{cite web}}: Missing or empty |title= (help) www.fifa.com https://www.fifa.com/en/tournaments/mens/wo
Curaçao national football team
Curaçao_national_football_team
Ecosystem that is void of large mammals
Empty forest is a term coined by Kent H. Redford's article "The Empty Forest" (1992), which was published in BioScience. An "empty forest" refers to an
Empty_forest
Type of logical argument that applies deductive reasoning
the existential fallacy, meaning they are invalid if they mention an empty category. These controversial patterns are marked in italics. All but four of
Syllogism
2016 single by Sting
Jim: The James Foley Story. "The Empty Chair" was nominated for the 2017 Academy Award in the Best Original Song category. Both Sting and J. Ralph have previously
The_Empty_Chair_(song)
for the category of algebras for a given monad. Eilenberg–Zilber category Eilenberg–Zilber category. empty The empty category is a category with no object
Glossary_of_category_theory
Order-zero graph or any edgeless graph
alternatively, to any edgeless graph (the latter is sometimes called an "empty graph"). The order-zero graph, K0, is the unique graph having no vertices
Null_graph
Type that allows only one value
is the terminal object in the category of types and typed functions. It should not be confused with the zero or empty type, which allows no values and
Unit_type
Country in West Africa
Northern Mande category includes the Dyula and the Maninka, the Kru category includes the Bété and the Kru, and the Southern Mande category includes the
Ivory_Coast
Swiss linguist and philosopher (1857–1913)
of transformations is accompanied by the positing of ‘empty categories’. These are categories that are not associated with a sign: they belong to units
Ferdinand_de_Saussure
Grammatical concept
and secondary objects. Many African languages fall into this typological category. Several Slavic and agglutinating languages (e.g. Turkish, Hungarian, Finnish)
Object_(grammar)
Set of arguments where two or more functions have the same value
proved that any equaliser in any category is a monomorphism. If the converse holds in a given category, then that category is said to be regular (in the
Equaliser_(mathematics)
Empty category occupying the subject position in non-finite clauses
(DP) without phonological content. As such, it is part of the set of empty categories. The null pronoun PRO is postulated in the subject position of non-finite
PRO_(linguistics)
Theory of syntax
government relation constrains the occurrence and identity of traces as the Empty Category Principle requires them to be properly governed. Binding can be defined
Government_and_binding_theory
2024 single by Linkin Park
"The Emptiness Machine" is a song by American rock band Linkin Park. It was released as the lead single from the band's eighth studio album, From Zero
The_Emptiness_Machine
Property regarding whether a lexical item denotes a transitive object
argued at length for the following two points: Though formally a broad category of phenomena, transitivity boils down to a way to maximally distinguish
Transitivity_(grammar)
Categorization of nouns and modifiers by function
A grammatical case is a category of nouns and noun modifiers (determiners, adjectives, participles, and numerals) that corresponds to one or more potential
Grammatical_case
Concept in mathematical category theory
In category theory, a branch of mathematics, a symmetric monoidal category is a monoidal category (i.e. a category in which a "tensor product" ⊗ {\displaystyle
Symmetric_monoidal_category
Semantic feature of noun phrases in linguistics
distinguish between a discrete (grammatical) and a non-discrete (cognitive) category."[p. 84] In English, definiteness is usually marked by the selection of
Definiteness
Linguistic notion of claims' support
(English: it seems to me). Some languages have a distinct grammatical category of evidentiality that is required to be expressed at all times. In contrast
Evidentiality
Semantic way in which a verb is structured in relation to time
been modified several times. Zeno Vendler classified verbs into four categories on whether they express "activity", "accomplishment", "achievement" or
Lexical_aspect
Set of axioms for set theory
In mathematics, the elementary theory of the category of sets or ETCS is a set of axioms for set theory proposed by William Lawvere in 1964. Although it
Elementary theory of the category of sets
Elementary_theory_of_the_category_of_sets
Category whose objects are topological spaces and whose morphisms are continuous maps
In mathematics, the category of topological spaces, often denoted T o p {\displaystyle \mathbf {Top} } , is the category whose objects are topological
Category of topological spaces
Category_of_topological_spaces
Set with exactly one element
{\displaystyle \{1\}} are not the same thing, and the empty set is distinct from the set containing only the empty set. A set such as { { 1 , 2 , 3 } } {\displaystyle
Singleton_(mathematics)
Sporting terminology
An empty net goal, abbreviated as EN or ENG and colloquially called an empty netter, occurs in several team sports when a team scores a goal into a net
Empty_net_goal
State of standing out as unusual
familiarity with cultural norms provided by familiar categories creates a ground against which marked categories provide a figure, opening the way for markedness
Markedness
In mathematics, the category of topological vector spaces is the category whose objects are topological vector spaces and whose morphisms are continuous
Category of topological vector spaces
Category_of_topological_vector_spaces
Bi-universal property in category theory
making it into a category with zero morphisms. The category of sets does not have a zero object, but it does have an initial object, the empty set ∅. The only
Zero_morphism
Off-road motorsport event in Saudi Arabia
stages, Al-Qassim, and to Riyadh for the rest day. Notably skipping the Empty Quarter, the rally will head west to new regions previously unexplored by
2026_Dakar_Rally
Association football position
and prevent the opposition from scoring. Defenders fall into four main categories: centre-backs, full-backs, sweepers, and wing-backs. The centre-back and
Defender (association football)
Defender_(association_football)
Category theory
Y)} . A(G) is an additive category with direct sums given by the disjoint union of G-sets and zero object given by the empty G-set; The product of two
Burnside_category
Number
boxes, or other symbols. 0 (zero, /ˈziː.roʊ/) is a number representing an empty quantity. Adding (or subtracting) 0 to any number leaves that number unchanged;
0
Language in which certain pronouns may sometimes be omitted
giving rise to a pronominal interpretation." (Bresnan 1982:384). The empty category assumed (under government and binding theory) to be present in the vacant
Pro-drop_language
Desert in the Arabian Peninsula
The Rub' al Khali (/ˈrʊb æl ˈkɑːli/; Arabic: ٱلرُّبْع ٱلْخَالِي, lit. 'Empty Quarter', [ar.rʊbʕ‿al.χaːliː]) is a desert encompassing most of the southern
Rub'_al_Khali
Theoretical framework in linguistics
languages license empty nuclei, which are subject to the phonological Empty Category Principle (ECP), similarly to the empty categories of syntax. Crucially
Government_phonology
Category whose objects are measurable spaces and whose morphisms are measurable maps
In mathematics, the category of measurable spaces, often denoted Meas, is the category whose objects are measurable spaces and whose morphisms are measurable
Category_of_measurable_spaces
Casino gambling machine
to the sides of early mechanical machines, and to the games' ability to empty players' pockets and wallets as thieves would. In the 1890s a number of
Slot_machine
Process of word formation, by alteration to express grammatical categories
formation in which a word is modified to express different grammatical categories such as tense, case, voice, aspect, person, number, gender, mood, animacy
Inflection
Complete absence of anything; the opposite of everything
philosophers, like René Descartes, continued to argue against the existence of empty space until the scientific discovery of a physical vacuum. Existentialists
Nothing
Category of aircraft in Canada
aircraft, a category that was eventually renamed "Amateur-built aircraft", leaving Canada without an ultralight category. The basic ultralight category was established
Ultralight_aircraft_(Canada)
Category where every morphism is invertible; generalization of a group
In mathematics, especially in category theory and homotopy theory, a groupoid (less often Brandt groupoid or virtual group) generalises the notion of group
Groupoid
terms. A terminal object in the category of contexts. It is denoted ⋄ {\displaystyle \diamond } and called the empty context. For each context Γ {\displaystyle
Semantics_of_type_theory
Any characteristic used to classify a phoneme or word
inflectional categories), which can have one of a set of potential values (also called the property, meaning, or feature of the category). For example
Feature_(linguistics)
subject List of common physics notations List of typographic features Category:Typographical symbols As defined in the Unicode standards Name of Wikipedia
List of typographical symbols and punctuation marks
List_of_typographical_symbols_and_punctuation_marks
Logical connective AND
defined as an operator or function of arbitrary arity, the empty conjunction (AND-ing over an empty set of operands) is often defined as having the result
Logical_conjunction
Expression of time reference in grammar
In grammar, tense is a category that expresses time reference. Tenses are usually manifested by the use of specific forms of verbs, particularly in their
Grammatical_tense
American music industry award
Album of the Year is the most prestigious category at the Grammy Awards and is one of the general field categories that have been presented annually since
Grammy Award for Album of the Year
Grammy_Award_for_Album_of_the_Year
Object that is both a product and coproduct
of finite direct sums of modules. Let C be a category with zero morphisms. Given a finite (possibly empty) collection of objects A1, ..., An in C, their
Biproduct
Mathematical theory of data types
The empty type has no terms. The type is usually written ⊥ {\displaystyle \bot } or 0 {\displaystyle \mathbb {0} } . One use for the empty type is
Type_theory
Grammatical category expressing how a verb extends over time
In linguistics, aspect is a grammatical category that expresses how a verbal action, event, or state, extends over time. For instance, perfective aspect
Grammatical_aspect
Mathematical form
is called a Cartesian category. Many of these are Cartesian closed categories. Sets are an example of such objects. The empty product on numbers and
Product_(mathematics)
Array of numbers
it is useful to consider a matrix with no rows or no columns, called an empty matrix. The specifics of symbolic matrix notation vary widely, with some
Matrix_(mathematics)
Linguistic category of nouns
In linguistics, a noun class is a particular category of nouns. A noun may belong to a given class because of the characteristic features of its referent
Noun_class
American actor (1970–1993)
Best Supporting Actor for his role in the Sidney Lumet drama Running on Empty (1988). He earned the Volpi Cup for Best Actor and the Independent Spirit
River_Phoenix
American actor (born 1955)
highly anticipated scenes in the film. The trio filmed their scene in an empty church on October 24, 2009. Willis next starred in Red, an adaptation of
Bruce_Willis
EMPTY CATEGORY
EMPTY CATEGORY
Girl/Female
Biblical
Den, making empty, watching.
Girl/Female
Biblical
Void, empty.
Boy/Male
Arabic, Australian, German, Greek, Kurdish
Empty; Void
Boy/Male
Tamil
One who is empty, Hollow, Vain
Biblical
empty; temple of the head
Boy/Male
Arabic
Empty.
Boy/Male
British, English, Spanish
Strong Leader; Empty
Boy/Male
Hindu, Indian
Empty
Girl/Female
Biblical
Den, cave, making empty.
Surname or Lastname
English
English : nickname for a foolish or eccentric person, from a diminutive of Foll, from Old French fol ‘mad’, ‘stupid’ (Late Latin follis, originally a noun denoting any of various objects filled with air, but later transferred to vain and empty-headed notions).
Biblical
den; making empty; watching
Boy/Male
American, Australian, Danish, French, Jamaican, Latin
Vain; Empty; Poor; Robbed; Hollow
Boy/Male
Biblical
Who is empty or exhausted.
Biblical
den; cave; making empty
Boy/Male
Hindu
One who is empty, Hollow, Vain
Biblical
who is empty, exhausted;free, empty, exhausted;
Girl/Female
Biblical
Empty, temple of the head.
EMPTY CATEGORY
EMPTY CATEGORY
Boy/Male
Arabic
Rich; Wealthy
Boy/Male
Hindu
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Aim; Target
Boy/Male
Welsh American Anglo Saxon
Ardent.
Girl/Female
Biblical
The light of redemption.
Girl/Female
Biblical
The mouth, the pass of Hiroth.
Boy/Male
Hindu
Cheerful
Girl/Female
Indian
Happy
Boy/Male
Hindu, Indian, Tamil
Son
Boy/Male
Hindu, Indian, Malayalam, Marathi
Pearl
EMPTY CATEGORY
EMPTY CATEGORY
EMPTY CATEGORY
EMPTY CATEGORY
EMPTY CATEGORY
compar.
of Empty.
v. i.
To become empty.
a.
To empty.
a.
Empty.
superl.
Containing nothing; not holding or having anything within; void of contents or appropriate contents; not filled; -- said of an inclosure, as a box, room, house, etc.; as, an empty chest, room, purse, or pitcher; an empty stomach; empty shackles.
v. t.
To deprive of the contents; to exhaust; to make void or destitute; to make vacant; to pour out; to discharge; as, to empty a vessel; to empty a well or a cistern.
v. t.
To empty.
imp. & p. p.
of Empty
a.
Empty; frivolous.
superl.
Destitute of effect, sincerity, or sense; -- said of language; as, empty words, or threats.
superl.
Destitute of, or lacking, sense, knowledge, or courtesy; as, empty brains; an empty coxcomb.
n.
An empty box, crate, cask, etc.; -- used in commerce, esp. in transportation of freight; as, "special rates for empties."
v. t.
To empty.
superl.
Destitute of reality, or real existence; unsubstantial; as, empty dreams.
pl.
of Empty
a.
Empty.
v. t.
To empty.
p. pr. & vb. n.
of Empty
n.
Love of empty of empty talk or noise.
superl.
Producing nothing; unfruitful; -- said of a plant or tree; as, an empty vine.