How to pronounce AFFIDAVIT. How to say AFFIDAVIT."affidavit". Listen to the audio pronunciation again. Having trouble hearing a pronunciation? A written declaration upon oath made before an authorized official. This video shows you How to Pronounce Affidavit, pronunciation guide. How to pronounce Middlesex. How to say Middlesex. 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."