aliens Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. beings from outer space or different planets. Example Sentence Some people think aliens exist in outer space. More Example Sentences Some people believe aliens exist in space. Synonyms extraterrestrials; beings; creatures Antonyms native; citizen; normal Hear It! Say It! Write It! aliens Switch to cursive Start Share with your friends: