Categories of the understanding

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The categories of the understanding are used in Immanuel Kant's philosophy. Categories are a priori features of our mind that permit our sensible apprehension and ordering of representations of objects. The categories include substance, quantity, quality, relation and modality:

Quantity - Unity, Plurality, Totality.
Quality - Reality, Negation, Limitation.
Relation - Inherence and Subsistence, Causality and Dependence, Community.
Modality - Possibility or Impossibility, Existence or Non-Existence, Necessity or Contingence.