The Collaborative International Dictionary of English v.0.48:

Vomiting \Vom"it*ing\, n.
   The spasmodic ejection of matter from the stomach through the
   mouth.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vomit \Vom"it\, v. i. [imp. & p. p. Vomited; p. pr. & vb. n.
   Vomiting.] [Cf. L. vomere, vomitum, and v. freq. vomitare.
   See Vomit, n.]
   To eject the contents of the stomach by the mouth; to puke;
   to spew.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vomiting
    n 1: the reflex act of ejecting the contents of the stomach
         through the mouth [syn: vomit, vomiting, emesis,
         regurgitation, disgorgement, puking]