Copulative in a sentence as a noun

It's not unscientific to define fatherhood in a way that doesn't involve genetic or copulative parentage.

Copulative in a sentence as an adjective

"No smoking" is a gerundive phrase which serves as the sentence's subject, with the copulative verb "is" implied: "No smoking [is] allowed".Considered differently, the sentence is not in the imperative mood with an implied subject.

Copulative definitions

noun

an equating verb (such as `be' or `become') that links the subject with the complement of a sentence

See also: copula

adjective

syntactically connecting sentences or elements of a sentence; "`and' is a copulative conjunction"