noun An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
I need proof of your unconditional love. Lend me some dough.
noun The degree of evidence which convinces the mind of any truth or fact, and produces belief; a test by facts or arguments which induce, or tend to induce, certainty of the judgment; conclusive evidence; demonstration.
noun The quality or state of having been proved or tried; firmness or hardness which resists impression, or does not yield to force; impenetrability of physical bodies.
noun Experience of something.
noun Firmness of mind; stability not to be shaken.
noun A proof sheet; a trial impression, as from type, taken for correction or examination.
noun A limited-run high-quality strike of a particular coin, originally as a test run, although nowadays mostly for collectors' sets.
noun A sequence of statements consisting of axioms, assumptions, statements already demonstrated in another proof, and statements that logically follow from previous statements in the sequence, and which concludes with a statement that is the object of the proof.