Strong's #4234: praxis (pronounced prax'-is)
 from 4238; practice, i.e. (concretely) an act; by extension, a function:--deed, office, work.
Thayer's Greek Lexicon:
 ͂ 
 
  praxis 
 
 1) a doing, a mode of acting, a deal, a transaction
 
 1a) the doings of the apostles
 1b) in a bad sense, wicked deed, crime, wicked doings (our practices, i.e. trickery)
 
 2) a thing to be done, business
 
  Part of Speech: noun feminine
Relation: from G4238
  Citing in TDNT: 6:642, 927
 
Usage:
This word is used 6 times:
Matthew 16:27: "every man according to his  works."
Luke 23:51: "to the counsel and  deed of them;) he was of Arimathaea, a city"
Acts 19:18: "and showed their  deeds."
Romans 8:13: "ye through the Spirit do mortify the  deeds of the body, ye shall live."
Romans 12:4: "not the same  office:"
Colossians 3:9: "old man with his  deeds;"