Reverie defined

From Dictionary.com

Word of the Day for Saturday, October 10, 2009

reverie \REV-uh-ree\, noun:

1. A state of dreamy meditation or fanciful musing.
2. A daydream.
3. A fantastic, visionary, or impractical idea.
4. Music. An instrumental composition of a vague and dreamy character.

Walking seems to have become Rousseau's chosen mode of being because within a walk he is able to live in thought and reverie, to be self-sufficient, and thus to survive the world he feels has betrayed him.
-- Rebecca Solnit, Wanderlust: A History of Walking

He was pulled out of his reverie by the buzzing of his cell phone.
-- Robert O'Harrow, No Place to Hide

From reveries so airy, from the toil
Of dropping buckets into empty wells,
And growing old in drawing nothing up.
-- William Cowper, The Task. Book iii. The Garden. Line 188.

Reverie is from Middle English, revelry, from Old French, from rever, to dream.