Noun

(countable) Anything that seems to be something that it is not.

We saw what looked like a tiger among the trees, but it was an illusion caused by the shadows of the branches.

Using artificial additives, scientists can create the illusion of fruit flavours in food.

* 2002 , (The Flaming Lips),

You realize the sun don't go down it's just an illusion caused by the world spinning round.

(countable) A misapprehension; a belief in something that is in fact not true.

Jane has this illusion that John is in love with her.

(countable) A magician’s trick.

(uncountable) The state of being deceived or misled.

Noun

(en noun)

(archaic) A caper, a frolic; merriment.

Noun

(en noun)

A state of dreaming while awake; a loose or irregular train of thought; musing or meditation; daydream.

* 1847 , Alfred Tennyson, The Princess , Canto VII, lines 107-108

we sat / But spoke not, rapt in nameless reverie ,

*{{quote-book, year=1913, author=

, title=Lord Stranleigh Abroad , chapter=3 citation , passage=He fell into a reverie', a most dangerous state of mind for a chauffeur, since a fall into ' reverie on the part of a driver may mean a fall into a ravine on the part of the machine.}}

* {{quote-news

, year=2012 , date=June 3 , author=Nathan Rabin , title=TV: Review: THE SIMPSONS (CLASSIC): “Mr. Plow” (season 4, episode 9; originally aired 11/19/1992) citation , page= , passage=Even the blithely unselfconscious Homer is more than a little freaked out by West’s private reverie , and encourages his spawn to move slowly away without making eye contact with the crazy man.}}

An extravagant conceit of the imagination; a vision.

* (rfdate)

If the minds of men were laid open, we should see but little difference between that of the wise man and that of the fool; there are infinite reveries and numberless extravagancies pass through both.