Extended Strong's Greek Lexicon (Abbott-Smith based)
demonstration
Usage: ἀπό-δειξις, -εως, ἡ (ἀποδείκνυμι) [in LXX: 3Ma.4:20, 4Ma.3:19 4Mac 13:10 * ;] __1. a showing off. __2. As used by Gk. philosophers, demonstration, certain proof: 1Co.2:4 (see ICC, in l; MM, see word; Lft., Notes, 173).† (AS)