Affidavit definition: . See examples of AFFIDAVIT used in a sentence.How to pronounce AFFIDAVIT. How to say AFFIDAVIT. Dictionaries contain lists of words arranged in alphabetical order, giving the definition, origins, and spelling of each word. 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."