Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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