n.1 excessive use of 'I' and 'me'.
2 the practice of talking about oneself.
3 an exaggerated opinion of oneself.
4 selfishness.
Derivatives:
egotist n. egotistic adj. egotistical adj. egotistically adv. egotize v.intr. (also -ise).
Etymology: EGO + -ISM with intrusive -t-