Mind (noun)

1. The faculty of a human being's consciousness which allows them to be aware of the world and their experiences, to think, and to feel emotions.
2. A person's mental and emotional processes; the seat of a person's thoughts, feelings, and consciousness.

Origin:

Old english gemynd "memory, intention," also "emotion," of germanic origin; related to dutch gedachte and german gedanke "thought".

Examples:

1. He has a great mind for mathematics.
2. She couldn't get the song out of her mind.
3. He made up his mind to become a doctor.
4. She's not in the right frame of mind to make a decision.
5. He lost his mind when he heard the news.