Egotist (noun)

1. A person who is excessively self-centered and self-absorbed.
2. A person who talks about themselves and their accomplishments excessively.

Origin:

From the latin word "ego" meaning "i" + "ist" meaning "person who".

Examples:

1. He was an egotist and always made the conversation about himself.
2. She was known for her egotistical behavior and always put herself first.
3. His egotism made it hard for anyone to have a meaningful conversation with him.
4. The egotist always talks about himself and his own achievements.
5. An egotist is someone who sees himself as the most important person in the room.