Etymology
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aurora (n.)

"morning light, dawn," late 14c., from Latin Aurora, the Roman goddess of dawn, from PIE *ausus- "dawn," also the name of the Indo-European goddess of the dawn, from root *aus- (1) "to shine," especially of the dawn (source also of Greek ēōs "dawn").

updated on October 29, 2018

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Definitions of aurora from WordNet
1
aurora (n.)
the first light of day;
Synonyms: dawn / dawning / morning / first light / daybreak / break of day / break of the day / dayspring / sunrise / sunup / cockcrow
aurora (n.)
an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force;
2
Aurora (n.)
(Roman mythology) goddess of the dawn; counterpart of Greek Eos;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.