How to pronounce AFFIDAVIT. How to say AFFIDAVIT.An affidavit is a written statement that you swear is true and that may be used as evidence in a court of law. 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. This video shows you How to Pronounce Affidavit, pronunciation guide. A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. "affidavit". Listen to the audio pronunciation again. Having trouble hearing a pronunciation?