a state of dreamy meditation or fanciful musing: lost in reverie.
a daydream.
a fantastic, visionary, or impractical idea: reveries that will never come to fruition.
Music. an instrumental composition of a vague and dreamy character.
Also, revery.

1325–75; Middle English < Old French reverie, derivative of rever to speak wildly. See rave, -ery

1. abstraction, brown study. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reverie or revery (ˈrɛvərɪ)
n , pl -eries
1.  an act or state of absent-minded daydreaming: to fall into a reverie
2.  a piece of instrumental music suggestive of a daydream
3.  archaic a fanciful or visionary notion; daydream
[C14: from Old French resverie wildness, from resver to behave wildly, of uncertain origin; see rave1]
revery or revery
[C14: from Old French resverie wildness, from resver to behave wildly, of uncertain origin; see rave1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., "wild conduct, frolic," from O.Fr. reverie "revelry, raving, delirium," from resver "to dream, wander, rave," of uncertain origin (also the root of rave). Meaning "daydream" is first attested 1650s. As a type of musical composition, it is attested from 1880.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So when you float off into a reverie, you're actually doing important
  data-storage work.
She found some comfort in taking last week's celebration out of the house, some
  quiet reverie he could not find for himself.
Only occasionally does her public self intrude upon her reverie of anonymity.
It's an album of empathy and reverie, with slippery complexities that only
  rarely serve as a distraction.
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