Thayer's Greek Lexicon

 1. to go out or come in: to enter
  1) of men or animals, as into a house or a city
  2) of Satan taking possession of the body of a person
  3) of things: as food, that enters into the eater's mouth
2. metaph.
  1) of entrance into any condition, state of things, society,
employment
2a1. to arise, come into existence, begin to be
2a2. of men, to come before the public
2a3. to come into life
  2) of thoughts that come into the mind