[τεκμήριον] neuter of a presumed derivative of τεκμάρ (a goal or fixed limit); a token (as defining a fact), i.e. criterion of certainty
Usages throughout the bible
Acts 1:3
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To whom also he shewed himself alive after his passion by many infallible proofs, G5039 being seen of them forty days, and speaking of the things pertaining to the kingdom of God: