Thayer's Greek Lexicon

 1. to have power, be powerful
  1) to be chief, be master of, to rule
2. to get possession of
  1) to become master of, to obtain
  2) to take hold of
  3) to take hold of, take, seize
2c1. to lay hands on one in order to get him into one's power
3. to hold
  1) to hold in the hand
  2) to hold fast, i.e. not discard or let go
3b1. to keep carefully and faithfully
  3) to continue to hold, to retain
3c1. of death continuing to hold one
3c2. to hold in check, restrain