Thayer's Greek Lexicon

 1. to hold back, detain, retain
  1) from going away
  2) to restrain, hinder (the course or progress of)
1b1. that which hinders, Antichrist from making his appearance
1b2. to check a ship's headway i.e. to hold or head the ship
  3) to hold fast, keep secure, keep firm possession of
2. to get possession of, take
  2) to possess