Etymology
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whim (n.)

1640s, "play on words, pun," shortened from whimwham "fanciful object" (q.v.). Meaning "caprice, fancy, sudden turn or inclination of the mind" first recorded 1690s, probably a shortened form of whimsy.

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Definitions of whim

whim (n.)
a sudden desire;
Synonyms: caprice / impulse
whim (n.)
an odd or fanciful or capricious idea;
Synonyms: notion / whimsy / whimsey
From wordnet.princeton.edu