The Collaborative International Dictionary
Confirmative
Confirmative \Con*firm"a*tive\, a. [L. confirmativus: cf. F.
confirmatif.]
Tending to confirm or establish.
--Sherwood. --
Con*firm"a*tive*ly, adv.
Wiktionary
confirmative
a. That serves to confirm
WordNet
confirmative
adj. serving to support or corroborate; "collateral evidence" [syn: collateral, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying]