Which of these is an excessive or exaggerated sense of self-importance?

Egotism is defined as the drive to maintain and enhance favorable views of oneself, and generally features an inflated opinion of one's personal features and importance. It often includes intellectual, physical, social and other overestimations.

The egotist has an overwhelming sense of the centrality of the 'Me', that is to say of their personal qualities. Egotism means placing oneself at the centre of one's world with no concern for others, including those "loved" or considered as "close", in any other terms except those subjectively set by the egotist.

Egotism is closely related to an egocentric love for one's imagined self or narcissism – indeed some would say "by egotism we may envisage a kind of socialized narcissism". Egotists have a strong tendency to talk about themselves in a self-promoting fashion, and they may well be arrogant and boastful with a grandiose sense of their own importance.

Egotism differs from both altruism – or behaviour motivated by the concern for others rather than for oneself – and from egoism, the constant pursuit of one's self-interest.

Narcissism is similar to egotism, but narcissists go a step further and fantasize about being in positions of grandeur or authority. Also, a narcissist may resort to psychological tricks to get what he or she wants. All narcissists are egotists, while not all egotists are narcissists.