Category (noun)

1. A group or class of people or things having characteristics in common.
2. A general class of things or concepts.
3. A division of a larger group.
4. A class of things, people or concepts that have similar characteristics.

Origin:

Late latin categoria, from greek katēgoria, from katēgoros accusing, from katēgorein to accuse, from kata- + agora assembly.

Examples:

1. He put the book in the science fiction category.
2. She grouped the animals into categories.
3. The category of fruits.
4. The category of vehicles.
5. The category of emotions.