Abbott-Smith Manual Greek Lexicon
ἀπό-δειξις (G585)
1 ** ἀπό-δειξις , -εως, ἡ ( ἀποδείκνυμι ), [in LXX: III Mac 4:20 , IV Mac 3:19 13:10 *;] a showing off . As used by Gk. philosophers, demonstration , certain proof : I Co 2:4 (v. ICC , in l.; MM, s.v.; Lft., Notes , 173).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain