From apodeiknumi; manifestation -- demonstration.
see GREEK apodeiknumi
a. a making manifest, showing forth.
b. a demonstration, proof: ἀπόδειξις πνεύματος καί δυνάμεως a proof by the Spirit and power of God, operating in me, and stirring in the minds of my hearers the most holy emotions and thus persuading them, 1 Corinthians 2:4 (contextually opposed to proof by rhetorical arts and philosophic arguments — the sense in which the Greek philosophers use the word; (see Heinrici, Corinthierbr. i., p. 103f)).