Pronunciation: (bō'nä fē'des; Eng. bō'nu fī'dēz or, esp. for 2, bō'nu-fīdz", bon'u),[key] 1. (italics) Latin.(used with a sing. v.) good faith; absence of fraud or deceit; the state of being exactly as claims or appearances indicate: The bona fides of this contract is open to question. Cf. mala fides. 2. (sometimes italics) (used with a pl. v.) the official papers, documents, or other items that prove authenticity, legitimacy, etc., as of a person or enterprise; credentials: All our bona fides are on file with the SEC.