aurora
B1CEFR level
20/100Rarity: fairly common
NeutralRegister
A natural light display in the polar sky.
They drove north for hours to catch the aurora over the fjord.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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