subcategoryPronunciation: /ˈsʌbkatɪg(ə)ri/Definition of subcategory noun (plural subcategories) a secondary or subordinate category. Derivatives subcategorization (also subcategorisation /-ˈzeɪʃ(ə)n/) noun subcategorize (also subcategorise) verb subcategory in other Oxford dictionaries Definition of subcategory in the US English dictionary