Verbs

(v)verifyconfirm the truth of“Please verify that the doors are closed”, “verify a claim”
(v)control, verifycheck or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard“Are you controlling for the temperature?”
(v)verifyattach or append a legal verification to (a pleading or petition)
(v)affirm, verify, assert, avow, aver, swan, swearto declare or affirm solemnly and formally as true“Before God I swear I am innocent”