Definition of: proof

(prf) noun
1. The act or process of proving, in any sense; specifically, the establishment of a fact by evidence or a truth by other truths.
2. A trial of strength, truth, fact, or excellence, etc.; a test.
3. Evidence and argument sufficient to induce belief.
4. Law Anything that serves to convince the mind of the truth or falsity of a fact or proposition, including facts and admissions of parties, which are properly called evidence, and presumptions either of fact or of law, and citations of law.
5. The state or quality of having successfully undergone a proof or test; impenetrability; also, impenetrable armor.
6. The standard of strength of alcoholic liquors: see PROOF SPIRIT.
7. Printing A printed trial sheet showing the contents or condition of matter in type or of a plate, or the like, either with or without marked corrections.
8. In engraving and etching, a trial impression taken from an engraved plate, stone, or block; also, a perfect impression from such a plate, etc., when finished, and usually before the title or inscription has been added.
9. Phot. A trial print from a negative.
10. Math. A process to check a computation by usmg its result; also, a demonstration.
11. Anything proved true; experience.
12. In philately, an experimental printing of a stamp.
—adjective
1. Employed in or connected with proving or correcting.
2. Capable of resisting successfully; firm; impenetrable: with against: proof against bribes.
3. Of standard alcoholic strength, as liquors. [<OF prueve <LL proba <probare PROVE] Synonyms (noun): attestation, certification, confirmation, demonstration, essay, evidence, fact, ordeal, test, testimony, trial. See CERTAINTY, DEMONSTRATION, TESTIMONY. Antonyms: assertion, conjecture, disproof, failure, fallacy, fancy, hypothesis, imagination, likelihood, possibility, presumption, probability, refutation.–proof combining form
1. Impervious to; able to withstand; not damaged by: waterproof, bombproof.
2. Protected against: mothproof, stormproof.
3. As strong as: armorproof.
4. Resisting; showing no effects of: joyproof, panicproof. Adjectives formed with –proof may also be used as verbs. [<PROOF, adjective]