A DEMONSTRATIVE proof — not a hint but the kind of sign that settles a case. Aristotle separates it from sēmeion, an ordinary sign that can mislead, and defines a tekmērion as the necessary sign that cannot be refuted (Rhetoric 1357b); Greek doctors used it of the symptom that makes a diagnosis certain. It appears once in the whole New Testament, of the risen Jesus presenting himself alive 'by many conclusive proofs' — courtroom-and-clinic vocabulary chosen at the exact point where the argument needs it. KJV 'many infallible proofs' catches the force; ASV's 'many proofs' loses it. → first discussed at Acts 1:3