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bona fi·des(fī′dēz, fīdz)
1. (used with a sing. verb) Good faith; sincerity.
2. (used with a pl. verb) Information or evidence that serves to guarantee a person's good faith, standing, and reputation; authentic credentials: "[His] operatic bona fides were prominently on display as he molded long, singing lines without any apparent pressure" (John von Rhein).
[Latin bona fidēs, good faith : bona, feminine of bonus, good + fidēs, faith.]
bona fides(ˈbəʊnə ˈfaɪdiːz)
(Law) law good faith; honest intention
bo•na fi•des(ˈboʊ nə ˈfaɪ diz, ˈfi deɪs or, esp. for 2, ˈboʊ nəˌfaɪdz, ˈbɒn ə)
1. (italics) Latin. (used with a sing. v.) good faith; absence of fraud or deceit; genuineness: The bona fides of this contract is not in question.
2. (sometimes italics) (used with a pl. v.) official documents or other items that prove authenticity, legitimacy, etc.; credentials.
usage: At least partially because it looks and sounds like an English plural, the Latin phrase bona fides has developed the plural sense “credentials,” taking a plural verb. Although criticized by some usage guides, this use has been increasing in recent decades.
Good faith. In evasion and recovery operations, the use of verbal or visual communication by individuals who are unknown to one another to establish their authenticity, sincerity, honesty, and truthfulness. See also evasion; evasion and recovery; recovery; recovery operations.