verifying

Concise Oxford English Dictionary © 2008 Oxford University Press:
verify /ˈvɛrɪfʌɪ/

▶verb (verifies, verifying, verified)

• 1 make sure or demonstrate that (something) is true, accurate, or justified.

• 2 Law swear to or support (a statement) by affidavit.

– derivatives
verifiable adjective,
verifiably adverb,
verifier noun.

– origin ME: from OFr. verifier, from med. L. verificare, from verus ‘true’.