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noun extraterrestrial n. A hypothetical form of life existing outside the Earth or its atmosphere, especially intelligent life on other planets or in other solar systems; as, what would you say to an extraterrestrial?. Synonyms: extraterrestrial being, alien.
adjective extraterrestrial adj. Originating or located or occurring outside Earth or its atmosphere; as, there is no clear evidence for extraterrestrial life.
Collaborative International Dictionary of English 0.48
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