1. A specifically defined division in a system of classification; a class.
2. A general class of ideas, terms, or things that mark divisions or coordinations within a conceptual scheme, especially:
3. aristotle's modes of objective being, such as quality, quantity, or relation, that are inherent in everything.
4. kant's modes of subjective understanding, such as singularity, universality, or particularity, that organize perceptions into knowledge.
5. A basic logical type of philosophical conception in post-kantian philosophy.
6. linguistics A classificatory structural unit or property of a language, such as a part of speech, verb phrase, or object.
7. linguistics A specific grammatical defining property of a linguistic unit or class, such as number or gender in the noun and tense or voice in the verb.

1. A group, often named or numbered, to which items are assigned based on similarity or defined criteria.
2. A collection of objects, together with a transitively closed collection of composable arrows between them, such that every object has an identity arrow, and such that arrow composition is associative.

1. one of the highest classes to which the objects of knowledge or thought can be reduced, and by which they can be arranged in a system; an ultimate or undecomposable conception; a predicament.
2. class; also, state, condition, or predicament.

1. in logic, a highest notion, especially one derived from the logical analysis of the forms of proposition.
2. A summum genus, or widest class.
3. any very wide and distinctive class; any comprehensive division or class of persons or things.
4.

1. a general concept that marks divisions or coordinations in a conceptual scheme
2. a collection of things sharing a common attribute