percent decrease Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a reduction in a number or amount, usually expressed as a fraction of 100. Example Sentence The report showed a fifteen percent decrease in sales compared to last year. Synonyms reduction; drop; decline Antonyms increase; rise Hear It! Say It! Write It! percent decrease Switch to cursive Start Share with your friends: