[ ek-struh-tuh-res-tree-uh l ]
/ ˌɛk strə təˈrɛs tri əl /


outside, or originating outside, the limits of the earth.


an extraterrestrial being: a science fiction novel about extraterrestrials conquering the earth.

Origin of extraterrestrial

First recorded in 1865–70; extra- + terrestrial

OTHER WORDS FROM extraterrestrial

ex·tra·ter·res·tri·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for extraterrestrial

British Dictionary definitions for extraterrestrial

/ (ˌɛkstrətɪˈrɛstrɪəl) /


occurring or existing beyond the earth's atmosphere


(in science fiction) a being from beyond the earth's atmosphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for extraterrestrial

[ ĕk′strə-tə-rĕstrē-əl ]

Originating, located, or occurring outside the Earth or its atmosphere.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for extraterrestrial

[ (ek-struh-tuh-res-tree-uhl) ]

A descriptive term for things outside the Earth, such as possible civilizations outside the solar system, or objects, such as meteorites, that actually reach the Earth.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.