Definition
From Mounce's Concise Greek-English Dictionary
Strong's Definition
a token (as defining a fact), i.e. criterion of certainty
Mounce Concise Greek-English Dictionary
a sign, indubitable token, clear proof, Acts 1:3*
Translated in KJV as
infallible proof
Etymology
neuter of a presumed derivative of (a goal or fixed limit);
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