plural auroras or aurorae
ə-ˈrȯr-(ˌ)ē 
ȯ-
1
: dawn
2
capitalized
: the Roman goddess of dawn compare eos
3
: a luminous phenomenon that consists of streamers or arches of light appearing in the upper atmosphere of a planet's magnetic polar regions and is caused by the emission of light from atoms excited by electrons accelerated along the planet's magnetic field lines
Examples of aurora in a Sentence
a gorgeous pink aurora aroused us out of our slumber
Recent Examples on the Web
Its presence in the night sky on Saturday may make any auroras harder to see, but that does depends on their intensity.
—
Jamie Carter, Forbes.com, 6 Sep. 2025
During major events, auroras might appear as early as sunset and linger until sunrise, with peak activity typically occurring around midnight.
—Maria Azzurra Volpe, MSNBC Newsweek, 1 Sep. 2025
This year marks the apex in an 11-year cycle of activity, which means more solar storms and gorgeous auroras could be on the way soon.
—Jackie Wattles, CNN Money, 1 Sep. 2025
In addition to their sheer radiance, auroras are especially captivating because of their unpredictability.
—Valerie Mesa, People.com, 1 Sep. 2025
See All Example Sentences for aurora
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Jamie Carter, Forbes.com, 6 Sep. 2025
During major events, auroras might appear as early as sunset and linger until sunrise, with peak activity typically occurring around midnight.
—Maria Azzurra Volpe, MSNBC Newsweek, 1 Sep. 2025
This year marks the apex in an 11-year cycle of activity, which means more solar storms and gorgeous auroras could be on the way soon.
—Jackie Wattles, CNN Money, 1 Sep. 2025
In addition to their sheer radiance, auroras are especially captivating because of their unpredictability.
—Valerie Mesa, People.com, 1 Sep. 2025
See All Example Sentences for aurora
Cite this Entry
“Aurora.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aurora. Accessed 8 Sep. 2025.
Copy CitationGeographical Definition
Aurora
geographical name
Au·ro·ra
ə-ˈrȯr-ə
ȯ-
1
city in north central Colorado east of Denver population 325,078
2
city west of Chicago in northeastern Illinois population 197,899
3
town north of Toronto in southeastern Ontario, Canada population 53,203
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