Etymology
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Martian (adj.)

late 14c., marcien "of, pertaining to, or characteristic of the planet Mars" (originally in reference to astrological influence), from Latin Martius "sacred to (the god) Mars; pertaining to (the planet) Mars," from Mars (genitive Martis; see Mars). From mid-15c. as "of or pertaining to the god Mars, warlike;" also sometimes "of or pertaining to the month of March" (1620s). The noun meaning "an inhabitant of the planet Mars" is attested by 1877.

updated on November 28, 2018

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Definitions of Martian from WordNet
1
Martian (n.)
imaginary people who live on the planet Mars;
2
Martian (adj.)
of or relating to the planet Mars (or its fictional inhabitants);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.