The Collaborative International Dictionary of English v.0.48:

Humiliation \Hu*mil`i*a"tion\, n. [L. humiliatio: cf. F.
   humiliation.]
   1. The act of humiliating or humbling; abasement of pride;
      mortification. --Bp. Hopkins.
      [1913 Webster]

   2. The state of being humiliated, humbled, or reduced to
      lowliness or submission.
      [1913 Webster]

            The former was a humiliation of Deity; the latter a
            humiliation of manhood.               --Hooker.
      [1913 Webster]

WordNet (r) 3.0 (2006):

humiliation
    n 1: state of disgrace or loss of self-respect
    2: strong feelings of embarrassment [syn: chagrin,
       humiliation, mortification]
    3: an instance in which you are caused to lose your prestige or
       self-respect; "he had to undergo one humiliation after
       another" [syn: humiliation, mortification]
    4: depriving one of self-esteem [syn: humiliation,
       abasement]

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "humiliation":
   abasement, affront, aspersion, atrocity, awkwardness, belittlement,
   breaking, brickbat, burning shame, byword, byword of reproach,
   comedown, conquering, contempt, contumely, crushing, cut,
   cut direct, debasement, deflation, degradation, depreciation,
   derogation, descent, despite, detraction, dirty shame,
   disconcertedness, discredit, disgrace, dishonor, disparagement,
   disregard, domestication, dump, embarrassment, enormity, flout,
   flouting, gentling, gibe, hangdog look, humbled pride, humbling,
   ignominy, indignity, injury, insult, jeer, jeering, letdown,
   low-down dirty shame, mock, mockery, mortification, obloquy,
   offense, outrage, put-down, quelling, rebuff, reduction, reproach,
   repulse, scandal, scoff, scurrility, self-abasement,
   self-abnegation, self-diminishment, setdown, shame, shamefacedness,
   shamefastness, shaming, slight, sneer, sniff, snort, snub, spurn,
   spurning, subdual, suppression, taming, taunt, the cold shoulder,
   the go-by, treading down, uncomplimentary remark