1. To try or to ascertain by an experiment, or by a test or standard; to test; as, to prove the strength of gunpowder or of ordnance; to prove the contents of a vessel by a standard measure. Thou hast proved mine heart. (Ps. Xvii. 3)
2. To evince, establish, or ascertain, as truth, reality, or fact, by argument, testimony, or other evidence. They have inferred much from slender premises, and conjectured when they could not prove. (J. H. Newman)
5. (Science: mathematics) To test, evince, ascertain, or verify, as the correctness of any operation or result; thus, in subtraction, if the difference between two numbers, added to the lesser number, makes a sum equal to the greater, the correctness of the subtraction is proved.
Origin: OE. Prover, F. Prouver, fr. L. Probare to try, approve, prove, fr. Probus good, proper. Cf. Probable, Proof, Probe.