growth rate Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the speed at which something increases over time. Example Sentence The area had a slow growth rate. More Example Sentences Farmers monitor the growth rate carefully. Synonyms increase; rise; expansion Antonyms decline; decrease; reduction Hear It! Say It! Write It! growth rate Switch to cursive Start Share with your friends: