IPA: /ˈiːɡəˌtɪzəm/
KK: /ˈiːɡəˌtɪzəm/
A strong focus on oneself, often involving bragging or talking too much about one's own achievements and importance.
His egotism made it difficult for others to enjoy the conversation.
Egotism is formed from "ego" (from Latin, meaning I or self) and "-ism" (a suffix used to denote a practice or philosophy). The word describes a practice or philosophy centered around oneself or self-importance.
Think of 'ego' meaning 'self' — that's why egotism refers to a focus on oneself.