Thayer's Greek Lexicon

 1. to be a spectator, look at, behold
  1) to view attentively, take a view of, survey
1a1. to view mentally, consider
2. to see
  1) to perceive with the eyes, to enjoy the presence of one
  2) to discern, descry
  3) to ascertain, find out by seeing

For Synonyms see entry G5848