Etymology
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egotism (n.)

1714, "too frequent use of 'I'," from ego + -ism. First used by Joseph Addison, who credits the term to "Port-Royalists" who used it in reference to obtrusive use of first person singular pronoun in writing, hence "talking too much about oneself." Meaning "self-conceit, selfishness" is from 1800. The -t- is abnormal, perhaps by influence of dogmatism.

updated on August 05, 2014

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Definitions of egotism from WordNet

egotism (n.)
an exaggerated opinion of your own importance;
Synonyms: self-importance / swelled head
egotism (n.)
an inflated feeling of pride in your superiority to others;
Synonyms: ego / self-importance
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.