Thayer's Greek Lexicon

 1. to become thoroughly acquainted with, to know thoroughly
  1) to know accurately, know well
2. to know
  1) to recognise
2a1. by sight, hearing, of certain signs, to perceive
who a person is
  2) to know i.e. to perceive
  3) to know i.e. to find out, ascertain
  4) to know i.e. to understand