criterion of certainty

: (for exx., v. MM, xxiv).† a sure sign, a positive proof Ac 1:3

kentekenen

a sign, certain proof.

clear proof

a token (as defining a fact), i.e. criterion of certainty

infallible proof

τεκμήριον, -ου, τό (τέκμαρ, a mark, sign), [in LXX: Wis.5:4 19:13, 3Ma.3:24 * ;] a sure sign, a positive proof: Act.1:1-26 (for exx., see MM, xxiv).† SYN.: ἔνδειγμα, q.v (AS)