circum Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition preposition. a prefix meaning 'around' or 'about'. Example Sentence Circumference starts with the prefix circum. More Example Sentences They walked circum the lake together. Synonyms around; about; surrounding Antonyms square Hear It! Say It! Write It! circum Switch to cursive Start Share with your friends: