Strong's #585: apodeixis (pronounced ap-od'-ike-sis)
 from 584; manifestation:--demonstration.
Thayer's Greek Lexicon:
 ̓́ 
 
  apodeixis 
 
 1) a making manifest, showing forth
 2) a demonstration, proof
 
  Part of Speech: noun feminine
Relation: from G584
 
Usage:
This word is used 1 times:
1 Corinthians 2:4: "wisdom, but in  demonstration of the Spirit and of power:"