1] the spirit, i.e. the vital principal by which the body is animated
   1.a] the rational spirit, the power by which the human being feels, thinks, decides
   2.b] the soul
2] 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
  2.a] a life giving spirit
   2.b] a human soul that has left the body
   2.c] a spirit higher than man but lower than God, i.e. an angel
       2.c.1] used of demons, or evil spirits, who were conceived as inhabiting the bodies of men
3] the disposition or influence which fills and governs the soul of any one
   3.a] the efficient source of any power, affection, emotion, desire, etc.
4] a movement of air (a gentle blast)
   4.a] of the wind, hence the wind itself
   4.a] breath of nostrils or mouth
derivation: from (4154)
http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=4151&version=kjv

(4154)
1] to breathe, to blow
   1.a] of the wind
http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=4154&version=kjv

Comment:
The assertions by Crosswalk that a ghost is the same as a spirit and the same as a soul are not completely correct. A self consists of the combination of a spirit and a soul. A spirit is a volition. A soul is a memory . The word "ghost" is apparently used to mean the combination of a spirit and a soul (a volition and a memory), rather than either spirit or soul by itself.