def·i·ni·tion ˌdefəˈniSH(ə)n/ noun noun: definition; plural noun: definitions 1. a statement of the exact meaning of a word, especially in a dictionary. an exact statement or description of the nature, scope, or meaning of something. "our definition of what constitutes poetry" synonyms: meaning, denotation, sense; interpretation, explanation, elucidation, description, clarification, illustration "the definition of "intelligence"" the action or process of defining something. 2. the degree of distinctness in outline of an object, image, or sound, especially of an image in a photograph or on a screen. synonyms: clarity, visibility, sharpness, crispness, acuteness; resolution, focus, contrast "the definition of the picture" the capacity of an instrument or device for making images distinct in outline. "we've been pleased with the definition of this TV"