The Collaborative International Dictionary of English v.0.48:

Self-esteem \Self`-es*teem"\, n.
   The holding a good opinion of one's self; self-complacency.
   [1913 Webster]

WordNet (r) 3.0 (2006):

self-esteem
    n 1: a feeling of pride in yourself [syn: self-esteem, self-
         pride]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "self-esteem":
   acquisitiveness, amour propre, amour-propre, arrogance, autism,
   autoeroticism, boastfulness, careerism, clear, complacency,
   conceit, consequentiality, ego trip, egoism, egotism, face,
   graspingness, greed, haughtiness, independence, individualism,
   interest, manifest, narcism, narcissism, obvious, overproudness,
   overweening pride, pardonable pride, personal aims,
   personal ambition, personal desires, personalism, plain,
   possessiveness, pride, pridefulness, prima facie, privatism,
   proudness, purse-pride, remoteness, self-absorption,
   self-admiration, self-advancement, self-approbation,
   self-centeredness, self-complacency, self-confidence,
   self-congratulation, self-consequence, self-consideration,
   self-containment, self-content, self-delight, self-devotion,
   self-endearment, self-evident, self-glorification,
   self-gratulation, self-importance, self-indulgence,
   self-infatuation, self-interest, self-interestedness,
   self-jealousy, self-love, self-occupation, self-pleasing,
   self-regard, self-reliance, self-respect, self-satisfaction,
   self-seeking, self-serving, self-solicitude, self-sufficiency,
   self-worship, selfishness, selfism, smugness, stiff-necked pride,
   stiff-neckedness, unmistakable, unquestionable, vaingloriousness,
   vainglory, vainness, vanity



The Devil's Dictionary (1881-1906):

SELF-ESTEEM, n.  An erroneous appraisement.