Affidavit definition: . See examples of AFFIDAVIT used in a sentence.How to pronounce AFFIDAVIT. How to say AFFIDAVIT. The term is pronounced as "afuhDAYvit. " Breaking it down: "af" as in "after," "uh" as in "umbrella," "DAY" with emphasis, and "vit" rhymes with "fit." "affidavit". Listen to the audio pronunciation again. Having trouble hearing a pronunciation? The historical English dictionary. The meaning of PRONUNCIATION is the act or manner of pronouncing something.