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TOEFL BNC: 42344 COCA: 34861
TOEFL BNC: 42344 COCA: 34861

rarefy

verb

rar·​e·​fy ˈrer-ə-ˌfī How to pronounce rarefy (audio)
variants or less commonly rarify
rarefied; rarefying

transitive verb

1
: to make rare, thin, porous, or less dense : to expand without the addition of matter
2
: to make more spiritual, refined, or abstruse

intransitive verb

: to become less dense

Example Sentences

Word History

TOEFL BNC: 42344 COCA: 34861

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