Thayer's Greek Lexicon

 1. a placing of one thing by the side of another, juxtaposition,
as of ships in battle
2. metaph.
  1) a comparing, comparison of one thing with another, likeness,
similitude
  2) an example by which a doctrine or precept is illustrated
  3) a narrative, fictitious but agreeable to the laws and usages of
human life, by which either the duties of men or the things of
God, particularly the nature and history of God's kingdom are
figuratively portrayed
  4) a parable: an earthly story with a heavenly meaning
3. a pithy and instructive saying, involving some likeness or
comparison and having preceptive or admonitory force
  1) an aphorism, a maxim
4. a proverb
5. an act by which one exposes himself or his possessions to danger,
a venture, a risk