Thayer's Greek Lexicon

 1. a movement of air (a gentle blast
  1) of the wind, hence the wind itself
  2) breath of nostrils or mouth
2. the spirit, i.e. the vital principal by which the body is animated
  1) the rational spirit, the power by which the human being feels,
thinks, decides
  2) the soul
3. a spirit, i.e. a simple essence, devoid of all or at least
all grosser matter, and possessed of the power of knowing,
desiring, deciding, and acting
  1) a life giving spirit
  2) a human soul that has left the body
  3) a spirit higher than man but lower than God, i.e. an angel
3c1. used of demons, or evil spirits, who were conceived
as inhabiting the bodies of men
3c2. the spiritual nature of Christ, higher than the highest
angels and equal to God, the divine nature of Christ
4. of God
  1) God's power and agency distinguishable in thought from his
essence in itself considered
4a1. manifest in the course of affairs
4a2. by its influence upon the souls productive in the
theocratic body (the church) of all the higher spiritual
gifts and blessings
4a3. the third person of the trinity, the God the Holy Spirit
5. the disposition or influence which fills and governs the soul
of any one
  1) the efficient source of any power, affection, emotion, desire, etc.