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English definition of “prove”

prove

verb  /pruv/ (past participle proved or proven  /ˈpru·vən/) us  

prove verb (SHOW)

to show after a time or by experience that something or someone has a particular quality: [L] The dispute over rights to the song could prove impossible to resolve. [+ to infinitive] The new safety procedures have so far proven to be satisfactory. As a newcomer, I felt I had to prove myself (= show I am skilled).

prove verb (MAKE CLEAR)

[T] to make it clear that something is or is not true: They suspected she cheated, but they could never prove it. [+ (that) clause] I had to take all my records to the bank to prove (that) the mistake was theirs. Under our legal system, you’re innocent until proven guilty.
proven
adjective [not gradable]  /ˈpru·vən/ us  
You can’t trust him – he’s a proven liar.
(Definition of prove from the Cambridge Academic Content Dictionary © Cambridge University Press)
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