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extraterrestrial (adj.)

also extra-terrestrial, "occurring or originating outside the Earth," 1812, from extra- + terrestrial. As a noun from 1956.

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Definitions of extraterrestrial from WordNet
1
extraterrestrial (n.)
a form of life assumed to exist outside the Earth or its atmosphere;
Synonyms: extraterrestrial being / alien
2
extraterrestrial (adj.)
originating or located or occurring outside Earth or its atmosphere;
is there extraterrestrial life?
From wordnet.princeton.edu

Dictionary entries near extraterrestrial

extrapolate

extrapolation

extrasensory

extra-special

extraspection

extraterrestrial

extraterritoriality

extravagance

extravagant

extravaganza

extravasation

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