RhymeZone: factive definitions

Definitions of factive:

adjective: (grammar, of a verb) Licensing only those content clauses that represent claims assumed to be true.
adjective: (epistemology, of a knowing agent) Which does not know any falsities: which knows only truths.
noun: (grammar) A factive verb.
adjective: (obsolete) Making.

(Definitions from Wiktionary)