A proof is sufficient evidence or a sufficient argument for the truth of a proposition. The concept applies in a variety of disciplines, with both the nature of the evidence or justification and the criteria for sufficiency being area-dependent. proof noun (PRINTED COPY) a printed copy of something that is examined and corrected before the final copies are printed: I was busy correcting proofs. a. 1. Proof against proofs; obstinate in the wrong. Webster's Revised Unabridged Dictionary, published by G. & C. Merriam Co. English Language Learners Definition of proof · something which shows that something else is true or correct · an act or process of showing that something is true. Proofs employ logic expressed in mathematical symbols, along with natural language which usually admits some ambiguity. In most mathematical literature, proofs. A proof is sufficient evidence or a sufficient argument for the truth of a proposition. The concept applies in a variety of disciplines, with both the. Proof has several uses; it can be a noun, an adjective, and rarely, a shortened form of the verb proofread. · Prove is a verb that either means to demonstrate. ✓ The fact that science never stops developing is proof that man never stops using his imagination. ✗ There are no proofs that gay couples are not able to. proof · in adjectives] · a bulletproof car · a waterproof jacket · an ovenproof dish (=that cannot be harmed by heat). Proof = incontrovertible evidence, is a concept: "These photographs and your fingerprints are proof that you were in the house." In this meaning.