copula
Definition - A word, usually a verb or a verb-like part of speech, that is used to link a sentence's subject to a predicate.

Notes:
1. The main copular verb in English is to be (e.g. is, was, were, and be).

Example -
Girls are nice.

Etymology -
The term derives from the Latin copulatus, which is the past participle of copulare, join together.

Oxford English Dictionary -
Its first citation is from 1650:
"It belongs to the Copula, or word (Is.)."
(Vind. Hammond's Addr. §62. 25)



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