twenty eight Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. andadjective. the cardinal number that is the sum of twentyseven and one Example Sentence He is twenty eight years old. Spelled as two words. Synonyms 28; XXVIII; one less than twenty-nine Antonyms zero Hear It! Say It! Write It! twenty eight Switch to cursive Start Share with your friends: