cardinal numbers Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a number such as 3 or . 1 or 412 used in counting to indicate quantity but not order Example Sentence Count to sixty using the cardinal numbers. Synonyms three; four; five Antonyms third; fifth; sixth Hear It! Say It! Write It! cardinal numbers Switch to cursive Start Share with your friends: