[hwim, wim]
an odd or capricious notion or desire; a sudden or freakish fancy: a sudden whim to take a midnight walk.
capricious humor: to be swayed by whim.

1635–45; short for whim-wham

1. whimsy, vagary, caprice.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
whim (wɪm)
1.  a sudden, passing, and often fanciful idea; impulsive or irrational thought
2.  a horse-drawn winch formerly used in mining to lift ore or water
[C17: from whim-wham]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1641, "pun or play on words," shortened from whimwham "fanciful object" (q.v.). Meaning "sudden notion, fancy, or idea" first recorded 1697, probably a shortened form of whimsy.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The difference between a brilliant idea and an utter failure is that squishiest
  benchmark in business: the whim of customers.
He should have an entourage of hangers-on jumping at his every whim.
Creatures like jellyfish lack their own way to get around and are mostly left
  to the whim of the wind and currents.
It's quick and easy to take your picture in a booth on a whim.
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