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
Decent aurora sightings in the U.S. are thus expected through 2026 and 2027.
—
Jamie Carter, Forbes.com, 25 July 2025
Human responses to ancient space weather For people on the ground at that time, auroras may have been the most immediate and striking effect, perhaps inspiring awe, fear, ritual behavior or something else entirely.
—Raven Garvey, Space.com, 24 July 2025
These events can trigger the dazzling auroras or, in some extreme cases, disable satellites and cause electrical grid failures.
—Matthew Glasser, ABC News, 21 July 2025
Both nights have a three on the Kp index, which measures geomagnetic activity and aurora intensity on a scale that ranges from zero to nine.
—Skyler Caruso, People.com, 16 July 2025
See All Example Sentences for aurora
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Jamie Carter, Forbes.com, 25 July 2025
Human responses to ancient space weather For people on the ground at that time, auroras may have been the most immediate and striking effect, perhaps inspiring awe, fear, ritual behavior or something else entirely.
—Raven Garvey, Space.com, 24 July 2025
These events can trigger the dazzling auroras or, in some extreme cases, disable satellites and cause electrical grid failures.
—Matthew Glasser, ABC News, 21 July 2025
Both nights have a three on the Kp index, which measures geomagnetic activity and aurora intensity on a scale that ranges from zero to nine.
—Skyler Caruso, People.com, 16 July 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 7 Aug. 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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