Thayer's Greek Lexicon

 1. to pick out, choose, to pick or choose out for one's self
  1) choosing one out of many, i.e. Jesus choosing his disciples
  2) choosing one for an office
  3) of God choosing whom he judged fit to receive his favours
and separated from the rest of mankind to be peculiarly his
own and to be attended continually by his gracious oversight
1c1. i.e. the Israelites
  4) of God the Father choosing Christians, as those whom he
set apart from the irreligious multitude as dear unto
himself, and whom he has rendered, through faith in Christ,
citizens in the Messianic kingdom: (James 2:5. so that the
ground of the choice lies in Christ and his merits only