Etymology
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proven (adj.)

"tried and proved," 1650s, adjective from alternative (strong) past participle, originally in Scottish legal use, of prove (v.). In this sense, Middle English had preved ("proved"), c. 1300.

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Definitions of proven

proven (adj.)
established beyond doubt;
a Soviet leader of proven shrewdness
a proven liar
Synonyms: proved
From wordnet.princeton.edu