extraterrestrials Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. existing or coming from a place outside planet Earth Example Sentence I read a novel about extraterrestrials conquering the earth. Synonyms alien; Martian; men from outer space Antonyms humans Hear It! Say It! Write It! extraterrestrials Switch to cursive Start Share with your friends: