nine o'clock Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the time of day when the clock shows nine. Example Sentence It's nine o'clock. More Example Sentences She wakes up at nine o'clock. Synonyms 9:00; hour; time Antonyms 2 a.m. Hear It! Say It! Write It! nine o'clock Switch to cursive Start Share with your friends: