noun🔗ShareA being originating from outside of the Earth's atmosphere, from space, or from another planet; an alien"The children excitedly discussed whether the strange lights in the sky were caused by an extraterrestrial. "beingspaceastronomysciencemythologyinhumanpersonChat with AIVocabulary GamePractice Reading
adjective🔗ShareOriginating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment."Scientists are studying extraterrestrial signals that might come from other planets. "spaceastronomyscienceChat with AIVocabulary GamePractice Reading
