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 (1a)
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.