Meaning

noun additional proof that something that was believed (some fact or hypothesis or theory) is correct

noun information that confirms or verifies

noun making something valid by formally ratifying or confirming it

originFrom Middle English confirmacioun, from Old French confirmacion, from Latin cōnfirmātiō, noun of process from cōnfirmātus (“confirmed”), perfect passive participle of cōnfirmāre, from con- (“with”) + firmāre (“to firm or strengthen”). Morphologically confirm + -ation.

Etymology from Wiktionary, CC BY-SA 3.0