Rapidly adv. : In a rapid manner.

Example:
How Rapidly does a star's absolute magnitude change by goes through a rapid change in luminosity?

Taxonomy
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Defination from the web:
rapidly in the Online Dictionary. Meaning of rapidly. Pronunciation of rapidly. Translations of rapidly. rapidly synonyms, rapidly antonyms. ... travel rapidly. vibrate. whirl. Whirler. Whirling. zoom. More results ...