The Collaborative International Dictionary of English v.0.48:

Inhale \In*hale"\, v. t. [imp. & p. p. Inhaled; p. pr. & vb.
   n. Inhaling.] [L. inhalare to breathe upon; pref. in- in +
   halare to breathe: cf. F. inhaler. Cf. Exhale.]
   To breathe or draw into the lungs; to inspire; as, to inhale
   air; -- opposed to exhale.
   [1913 Webster]

         Martin was walking forth to inhale the fresh breeze of
         the evening.                             --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inhale
    v 1: draw deep into the lungs in by breathing; "Clinton smoked
         marijuana but never inhaled"
    2: draw in (air); "Inhale deeply"; "inhale the fresh mountain
       air"; "The patient has trouble inspiring"; "The lung cancer
       patient cannot inspire air very well" [syn: inhale,
       inspire, breathe in] [ant: breathe out, exhale,
       expire]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "inhale":
   aspirate, blow, breathe, breathe hard, breathe in, breathe out,
   chain-smoke, chaw, chew, cough, drag, draw, draw in, exhale,
   exhaust, expel, expire, gasp, gulp, hack, hiccup, huff,
   inhale snuff, inspire, nose, pant, puff, pull, respire, scent,
   sigh, slurp, smell, smell of, smoke, sneeze, sniff, sniffle, snore,
   snort, snuff, snuff in, snuffle, suck, suck in, suckle, take snuff,
   wheeze, whiff