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proof n

[alteration of Middle English preove , from Old French preuve , from Late Latin proba , from Latin probare to prove]
1 : the effect of evidence sufficient to persuade a reasonable person that a particular fact exists see also evidence
2 : the establishment or persuasion by evidence that a particular fact exists see also burden of proof
3 : something (as evidence) that proves or tends to prove the existence of a particular fact see also clear and convincing , preponderance of the evidence , reasonable doubt , standard of proof compare allegation , argument
4 : probate

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.