aurora

noun

au·​ro·​ra ə-ˈrȯr-ə How to pronounce aurora (audio)
ȯ-
plural auroras or aurorae ə-ˈrȯr-(ˌ)ē How to pronounce aurora (audio)
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
auroral adjective
aurorean adjective

Examples of aurora in a Sentence

a gorgeous pink aurora aroused us out of our slumber
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The higher the number, the greater the chance of seeing auroras farther from their usual polar regions. Daisy Dobrijevic, Space.com, 10 Oct. 2025 Solar storms are expected to increase the chance of geomagnetic activity, according to NOAA’s Space Weather Prediction Center, increasing the potential for another round of auroras at high and possibly mid-latitudes. Valerie Mesa, PEOPLE, 7 Oct. 2025 Despite its nocturnal state, the alien sphere still glows with auroras brighter than the Earth’s northern lights. Chris Young, Interesting Engineering, 1 Oct. 2025 What are the best places in Wisconsin to watch the aurora borealis? Cailey Gleeson, jsonline.com, 30 Sep. 2025 See All Example Sentences for aurora

Word History

Etymology

Latin — more at east

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of aurora was in the 14th century

Browse Nearby Words

Cite this Entry

“Aurora.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aurora. Accessed 16 Oct. 2025.

Kids Definition

aurora

noun
au·​ro·​ra ə-ˈrōr-ə How to pronounce aurora (audio)
ȯ-ˈrōr-,
-ˈrȯr-
plural auroras or aurorae -ē How to pronounce aurora (audio)
auroral adjective

Geographical Definition

Aurora

geographical name

Au·​ro·​ra ə-ˈrȯr-ə How to pronounce Aurora (audio)
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

More from Merriam-Webster on aurora

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!