four-fifths Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a fraction representing four parts out of five. Example Sentence Four-fifths of the pie is left. Spelled with a hyphen. More Example Sentences She ate four-fifths of the pizza slice. Synonyms fraction; part; portion Antonyms no antonyms for this word Hear It! Say It! Write It! four-fifths Switch to cursive Start Share with your friends: