Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

aurora

play
noun au·ro·ra \ə-ˈrȯr-ə, ȯ-\

Definition of aurora

plural auroras or au·ro·raeplay \-(ˌ)ē\

  1. 1 :  dawn

  2. 2 capitalized :  the Roman goddess of dawn — compare eos

  3. 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

au·ro·ral play \-əl\ adjective
au·ro·re·an play \-ē-ən\ adjective


Examples of aurora

  1. <a gorgeous pink aurora aroused us out of our slumber>



Origin of aurora

Latin — more at east


First Known Use: 14th century


Aurora

play
geographical name Au·ro·ra \ə-ˈrȯr-ə, ȯ-\

Definition of Aurora

  1. 1 city N cen Colorado E of Denver pop 325,078

  2. 2 city NE Illinois pop 197,899

  3. 3 town Canada in SE Ontario pop 53,203




Learn More about aurora


Seen and Heard

What made you want to look up aurora? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 11, 2016

the holder of an office

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

196.5 pounds 2.2 pounds 16.96 pounds 100 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ