unit cube Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a cube with sides measuring one unit in length. Example Sentence The volume of a unit cube is exactly one cubic unit. More Example Sentences It helps to understand volume and area. Synonyms one-cubic unit; cubic unit; cube Antonyms large cube; multiple unit cube Hear It! Say It! Write It! unit cube Switch to cursive Start Share with your friends: