envelopes Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. flat paper containers used to hold letters. Example Sentence Please use envelopes of the regulation size. More Example Sentences The envelopes were colorful and bright. Synonyms covers; packets; wrappers Antonyms loose paper Hear It! Say It! Write It! envelopes Switch to cursive Start Share with your friends: