Define category: any of several fundamental and distinct classes to which entities or concepts belong — category in a sentenceThis disambiguation page lists articles associated with the title Category. If an internal link led you here, you may wish to change the link to point directly to the Define category. category synonyms, category pronunciation, category translation, English dictionary definition of category. n. pl. cat·e·go·ries 1. A specifically Category definition, any general or comprehensive division; a class. See more.