The Collaborative International Dictionary of English v.0.48:

Ingest \In*gest"\, v. t. [L. ingenium, p. p. of ingerere to put
   in; pref. in- in + gerere to bear.]
   1. To take into, or as into, the stomach or alimentary canal.
      --Sir T. Browne.
      [1913 Webster]

   2. To take into the body by any means, as by inhalation,
      injection, absorption, as well as through the mouth.
      [PJC]

WordNet (r) 3.0 (2006):

ingest
    v 1: serve oneself to, or consume regularly; "Have another bowl
         of chicken soup!"; "I don't take sugar in my coffee" [syn:
         consume, ingest, take in, take, have] [ant:
         abstain, desist, refrain]
    2: take up mentally; "he absorbed the knowledge or beliefs of
       his tribe" [syn: absorb, assimilate, ingest, take in]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "ingest":
   ablate, absorb, assimilate, bleed white, burn up, consume, deplete,
   devour, digest, dispatch, dispose of, down, drain,
   drain of resources, drink, drink in, eat, eat up, engorge, engulf,
   erode, exhaust, expend, feed on, finish, finish off, get away with,
   get down, gobble, gobble up, gulp, gulp down, imbibe, impoverish,
   ingurgitate, meal, partake of, percolate in, put away, seep in,
   soak in, soak up, spend, squander, suck dry, surround, swallow,
   swallow up, swill, swill down, take, take down, take in, tuck in,
   use up, waste away, wear away, wolf down