It comes from a past tense form of the Latin verb affidare, meaning "to pledge"; in Latin, affidavit translates to "he or she has made a pledge. A written statement that someone makes after promising officially to tell the truth.An affidavit can be used as proof in a law court. A written declaration upon oath made before an authorized official. This video shows you How to Pronounce Affidavit, pronunciation guide. How to pronounce AFFIDAVIT. How to say AFFIDAVIT. The term is pronounced as "afuhDAYvit. How to say Bexar in English? Pronunciation of Bexar with 3 audio pronunciations, 1 meaning, 5 translations, 40 sentences and more for Bexar.