Roman numeral Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition a symbol in the old Roman notation; I means one; V means 5; X means 10; L means 50; C means 100; D means 500; M means 1000 Example Sentence He was not sure what Arabic number the Roman numeral stood for. Synonyms I; V; X; L; C; D Antonyms 1; 2; 3; 4; 5 Hear It! Say It! Write It! Roman numeral Switch to cursive Start Share with your friends: