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Definition of extraterrestrial

extraterrestrial

/ˌɛk.strə.təˈrɛs.tri.əl/
ex · tra · ter · res · tri · al
Adverb:extraterrestrially
•
Plural:extraterrestrials
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extraterrestrial Lexical Profile

• adjective

1

Originating, existing, or occurring outside the Earth or its atmosphere.

Example

"Astronomers use powerful radio telescopes to search the cosmos for signs of extraterrestrial life."

Synonyms
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Antonyms
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• noun

1

A hypothetical or fictional being originating from a planet or celestial body other than Earth.

Example

"The classic science fiction film tells the story of a friendly extraterrestrial who becomes stranded on Earth."

Synonyms
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Antonyms
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• Rhymes for extraterrestrial

• Nearby Words

extrapolate
extrapolation
extrasensory
extraterrestrial
extravagance
extravagant
extravagantly

Word Origin & Etymology

First recorded in the early 19th century, formed from the Latin prefix extra- ('outside' or 'beyond') and terrestrial, from Latin terrestris ('earthly', from terra, meaning 'earth'). The noun sense referring to a hypothetical intelligent being from outer space was popularized by mid-20th-century science fiction.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Extraterrestrial. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/extraterrestrial
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