The Collaborative International Dictionary of English v.0.48:

Abasement \A*base"ment\ ([.a]*b[=a]s"ment), n. [Cf. F.
   abaissement.]
   The act of abasing, humbling, or bringing low; the state of
   being abased or humbled; humiliation.
   [1913 Webster]

WordNet (r) 3.0 (2006):

abasement
    n 1: a low or downcast state; "each confession brought her into
         an attitude of abasement"- H.L.Menchken [syn: abasement,
         degradation, abjection]
    2: depriving one of self-esteem [syn: humiliation,
       abasement]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "abasement":
   bump, bust, casting down, comedown, debasement, deflation,
   degradation, degrading, demotion, depluming, descent, disgrace,
   disgrading, displuming, downgrading, dump, embarrassment,
   hangdog look, humbled pride, humbling, humiliation, letdown,
   mortification, put-down, reduction, self-abasement,
   self-abnegation, self-diminishment, setdown, shame, shamefacedness,
   shamefastness, stripping of rank



The Devil's Dictionary (1881-1906):

ABASEMENT, n.  A decent and customary mental attitude in the presence
of wealth of power.  Peculiarly appropriate in an employee when
addressing an employer.