the substantive verb
Definition - Anything that expresses existence is substantive; hence the verb to be is called the substantive verb.

Example -
That which is: is — is it not?

Etymology -
The French introduced the grammatical term substantive in about 1393 to distinguish nouns from adjectives. It derives from the Latin phrase nomen substantivum, name or word of substance.

Oxford English Dictionary -
The word substantive's first citation is from 1393:
"As adiectif and substantyf vnite asken, Acordaunce in kynde, in cas and in numbre."
(Langl. P. Pl. C. iv. 338)

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