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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Originating, located, or occurring outside Earth or its atmosphere: intelligent extraterrestrial life.
  2. n. An extraterrestrial being or life form.

Century Dictionary and Cyclopedia

  1. Occurring outside of the earth; extramundane.

Wiktionary

  1. adj. Originating from outside of the Earth's atmosphere, from space, or from another planet; alien to Earth or its environment.
  2. n. A being originating from outside of the Earth's atmosphere, from space, or from another planet; an alien

GNU Webster's 1913

  1. adj. originating or located or occurring outside Earth or its atmosphere.
  2. n. a hypothetical form of life existing outside the Earth or its atmosphere, especially intelligent life on other planets or in other solar systems.

WordNet 3.0

  1. n. a form of life assumed to exist outside the Earth or its atmosphere
  2. adj. originating or located or occurring outside Earth or its atmosphere

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‘extraterrestrial’ has been looked up 1299 times, added to 15 lists, and is not a valid Scrabble word.