Etymology
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raving (adj.)

late 15c., "delirious, frenzied," present-participle adjective from rave (v.). The sense of "remarkable, fit to excite admiration" is from 1841, hence slang superlative use.

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Definitions of raving
1
raving (n.)
declaiming wildly;
the raving of maniacs
2
raving (adv.)
in a raving manner;
raving mad
Synonyms: ravingly
From wordnet.princeton.edu