The Collaborative International Dictionary of English v.0.48:

Snort \Snort\, v. i. [imp. & p. p. Snorted; p. pr. & vb. n.
   Snorting.] [OE. snorten; akin to snoren. See Snore.]
   1. To force the air with violence through the nose, so as to
      make a noise, as do high-spirited horsed in prancing and
      play. --Fairfax.
      [1913 Webster]

   2. To snore. [R.] "The snorting citizens." --Shak.
      [1913 Webster]

   3. To laugh out loudly. [Colloq.] --Halliwell.
      [1913 Webster]

WordNet (r) 3.0 (2006):

snorting
    n 1: an act of forcible exhalation [syn: puffing, huffing,
         snorting]