The Collaborative International Dictionary of English v.0.48:

Egotist \E"go*tist\, n. [L. ego I + ending -tist for -ist. See
   Egotism, and cf. Egoist.]
   One addicted to egotism; one who speaks much of himself or
   magnifies his own achievements or affairs. Egotistic

WordNet (r) 3.0 (2006):

egotist
    n 1: a conceited and self-centered person [syn: egotist,
         egoist, swellhead]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "egotist":
   Narcissus, braggart, careerist, egocentric, egoist, fortune hunter,
   hog, individualist, know-it-all, lone wolf, loner, monopolist,
   narcissist, narcist, no modest violet, road hog, self-advancer,
   self-pleaser, self-seeker, self-server, smart aleck, swellhead,
   temporizer, timepleaser, timeserver, tufthunter



The Devil's Dictionary (1881-1906):

EGOTIST, n.  A person of low taste, more interested in himself than in
me.

    Megaceph, chosen to serve the State
    In the halls of legislative debate,
    One day with all his credentials came
    To the capitol's door and announced his name.
    The doorkeeper looked, with a comical twist
    Of the face, at the eminent egotist,
    And said:  "Go away, for we settle here
    All manner of questions, knotty and queer,
    And we cannot have, when the speaker demands
    To be told how every member stands,
    A man who to all things under the sky
    Assents by eternally voting 'I'."