Originating, located, or occurring outside Earth or its atmosphere: intelligent extraterrestrial life.
An extraterrestrial being or life form.
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2003. Published by Houghton Mifflin Company. All rights reserved.
ThesaurusLegend: Synonyms Related Words AntonymsNoun 1. extraterrestrial - a form of life assumed to exist outside the Earth or its atmosphere
extraterrestrial being, alien
hypothetical creature - a creature that has not been observed but is hypothesized to
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