noun, plural copulas, copulae [kop-yuh-lee] .
something that connects or links together.
Also called linking verb. Grammar. a verb, as be, seem, or look, that serves as a connecting link or establishes an identity between subject and complement. Compare action verb.
Logic. a word or set of words that acts as a connecting link between the subject and predicate of a proposition.

1640–50; < Latin cōpula, equivalent to co- co- + ap- fasten (see apt) + -ula -ule

copular, adjective

copula, cupola. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
copula (ˈkɒpjʊlə)
n , pl -las, -lae
1.  a verb, such as be, seem, or taste, that is used merely to identify or link the subject with the complement of a sentence. Copulas may serve to link nouns (or pronouns), as in he became king, nouns (or pronouns) and adjectival complements, as in sugar tastes sweet, or nouns (or pronouns) and adverbial complements, as in John is in jail
2.  anything that serves as a link
3.  logic the often unexpressed link between the subject and predicate terms of a categorial proposition, as are in all men are mortal
[C17: from Latin: bond, connection, from co- together + apere to fasten]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1650, from L. copula (see copulate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

copula cop·u·la (kŏp'yə-lə)
A narrow part connecting two structures.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The copula should always agree with the subject, not with the complement.
The same order of words is required by the copula with whatever kind of complement.
Each is a sequence of noun-copula-adjective-infinitive verb.
The copula is present if the superlative is used predicatively.
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