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." Definitions of 'affidavit'. An affidavit is a written statement which you swear is true and which may be used as evidence in a court of law. Affidavit definition: . How to say affidavit in English?