Proof is evidence or argument that forces someone to believe something as true.(noun)
An example of proof is someone returning to eat at the same restaurant many times showing they enjoy the food.
See proof in Webster's New World College Dictionary
Origin: ME profe < OFr prueve < LL proba < L probare: see probe
Origin: < proof
See proof in American Heritage Dictionary 4
Origin: Middle English prove, preve
Origin: , from Anglo-Norman prove
Origin: and from Old French prueve
Origin: , both from Late Latin proba
Origin: , from Latin probāre, to prove; see prove.
Learn more about proof