affects Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to have an influence on something or someone. Example Sentence The study of how music affects our lives is called musicology. More Example Sentences Many factors affect how plants grow. Synonyms influence; impact; alter Antonyms ignore; neglect; disregard Hear It! Say It! Write It! affects Switch to cursive Start Share with your friends: