Thayer's Greek Lexicon

 1. picked out, chosen
  1) chosen by God,
1a1. to obtain salvation through Christ
1a  1) Christians are called "chosen or elect" of God
1a2. the Messiah in called "elect", as appointed by God to the
most exalted office conceivable
1a3. choice, select, i.e. the best of its kind or class,
excellence preeminent: applied to certain individual
Christians