Definition of bona fides
1
: good faith : sincerity
2
: the fact of being genuine
—often plural in construction
3
: evidence of one's good faith or genuineness
—often plural in construction
4
: evidence of one's qualifications or achievements
—often plural in construction
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Merriam-Webster unabridged
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Time Traveler for bona fides
The first known use of bona fides was in 1665
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