Etymology
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auroral (adj.)

1550s, "pertaining to dawn," from aurora + -al (1). Meaning "of the color of dawn" is from 1827; meaning "of the aurora borealis" is from 1828.

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Definitions of auroral

auroral (adj.)
of or relating to the atmospheric phenomenon auroras;
a prominent green line in the spectrum of the auroras is called the `auroral line'
auroral (adj.)
characteristic of the dawn;
a dim auroral glow
Synonyms: aurorean
From wordnet.princeton.edu