Definition of extraterrestrial in US English:

extraterrestrial

adjective

  • Of or from outside the earth or its atmosphere.

    ‘searches for extraterrestrial intelligence’
    • ‘The period of these signals was so precise that they were initially thought to be signs of extraterrestrial intelligence.’
    • ‘Scientists are of two minds regarding the existence of extraterrestrial intelligence.’
    • ‘Other sources of high iridium concentrations are extraterrestrial objects, such as meteorites or comets.’
    • ‘Not far from the site of delivery of Earth's first extraterrestrial calling card was a pretty little dell.’
    • ‘Organic molecules, such as amino acids, organic acids, and sugars have been observed in material from extraterrestrial sources in the solar system.’
    • ‘Despite the likelihood that humans are alone in the universe, the search for extraterrestrial intelligence will continue, said famed scientist Jill Tarter.’
    • ‘As only Earth meets this requirement, there is no extraterrestrial life in the solar system.’
    • ‘No other robotic spacecraft has ever collected extraterrestrial material and returned it to Earth.’
    • ‘But, Sagan was also known for his optimistic search for extraterrestrial intelligence.’
    • ‘Meanwhile, belief in extraterrestrial intelligences continues to grow with an almost religious fervour.’
    • ‘I suggest that green fireballs may be extraterrestrial probes entering our atmosphere.’
    • ‘A former teacher founded the cult in 1969 and claimed to have shielded earth from extraterrestrial invasion on numerous occasions.’
    • ‘One additional data point about how frequently life occurs in the universe is not going to settle any debates about extraterrestrial intelligence.’
    • ‘Obviously if UFOs are as rampant as people claim, SETI would be overloaded with messages of extraterrestrial intelligence.’
    • ‘It appears increasingly likely that there are extraterrestrial environments that could support Earth organisms.’
    • ‘Meteorites, on the other hand, are extraterrestrial material that have made it to Earth's surface and can weigh many tons.’
    • ‘Richard and Scott both believed there was extraterrestrial life beyond Earth.’
    • ‘I have nothing against scientific surveys scanning the heavens for signs of extraterrestrial intelligence.’
    • ‘The researchers still didn't detect extraterrestrial microorganisms on Earth.’
    • ‘It is possible that the increase of stardust in the Solar System will influence the amount of extraterrestrial material that rains down to Earth.’
    other-worldly, not of this world, supernatural, preternatural, alien
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noun

  • A hypothetical or fictional being from outer space, especially an intelligent one.

    • ‘The shortage of black speculative fiction writers and fans in no way means there is a lack of interest in outer space, flying saucers, or extraterrestrials in the black community.’
    • ‘Mars has long been considered not only difficult to explore but alluring, given its reputation as the most likely spot in the solar system to harbor extraterrestrials.’
    • ‘This is an extremely hard subject to present to people that are not knowledgeable about physics or science in general and extraterrestrials in particular.’
    • ‘While science fiction routinely describes face-to-face encounters with intelligent aliens, it may be that we will never actually meet extraterrestrials.’
    • ‘The two principal alternatives to the explanation that crop circles are made by humans are that they are made by extraterrestrials, or that they are made naturally by wind vortices.’
    extraterrestrial, et
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Pronunciation

extraterrestrial

/ˌekstrətəˈrestrēəl//ˌɛkstrətəˈrɛstriəl/