reflexes Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. quick and automatic movements in response to a stimulus. Example Sentence The doctor used a percussor to test my reflexes. More Example Sentences Reflexes help us react to sudden changes. Synonyms responses; reactions; instincts Hear It! Say It! Write It! reflexes Switch to cursive Start Share with your friends: