a succession of images, thoughts, or emotions passing through the mind during sleep.
the sleeping state in which this occurs.
an object seen in a dream.
an involuntary vision occurring to a person when awake.
a vision voluntarily indulged in while awake; daydream; reverie.
an aspiration; goal; aim: A trip to Europe is his dream.
a wild or vain fancy.
something of an unreal beauty, charm, or excellence.
verb (used without object), dreamed or dreamt, dreaming.
to have a dream.
to indulge in daydreams or reveries: He dreamed about vacation plans when he should have been working.
to think or conceive of something in a very remote way (usually followed by of ): I wouldn't dream of asking them.
verb (used with object), dreamed or dreamt, dreaming.
to see or imagine in sleep or in a vision.
to imagine as if in a dream; fancy; suppose.
to pass or spend (time) in dreaming (often followed by away ): to dream away the afternoon.
most desirable; ideal: a dream vacation.
Verb phrases
dream up, to form in the imagination; devise: They dreamed up the most impossible plan.

1200–50; Middle English dreem, Old English drēam joy, mirth, gladness, cognate with Old Saxon drōm mirth, dream, Old Norse draumr, Old High German troum dream; modern sense first recorded in ME but presumably also current in Old English, as in Old Saxon

dreamful, adjective
dreamfully, adverb
dreamfulness, noun
dreamingly, adverb
dreamlike, adjective
redream, verb, redreamed or redreamt, redreaming.
undreamed, adjective
undreaming, adjective
undreamlike, adjective

1. Dream, nightmare and vision refer to the kinds of mental images that form during sleep. Dream is the general term for any such succession of images. A nightmare is a dream that brings fear or anxiety: frightened by a nightmare. Vision refers to a series of images of unusual vividness, clarity, order, and significance, sometimes seen in a dream.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dream (driːm)
1.  a.  mental activity, usually in the form of an imagined series of events, occurring during certain phases of sleep
 b.  (as modifier): a dream sequence
 c.  (in combination): dreamland Related: oneiric
2.  a.  a sequence of imaginative thoughts indulged in while awake; daydream; fantasy
 b.  (as modifier): a dream world
3.  a person or thing seen or occurring in a dream
4.  a cherished hope; ambition; aspiration
5.  a vain hope
6.  a person or thing that is as pleasant, or seemingly unreal, as a dream
7.  go like a dream to move, develop, or work very well
vb (when intr, foll by of or about) (foll by of) , dreams, dreaming, dreamed, dreamt
8.  (may take a clause as object) to undergo or experience (a dream or dreams)
9.  (intr) to indulge in daydreams
10.  (intr) to suffer delusions; be unrealistic: you're dreaming if you think you can win
11.  to have an image (of) or fantasy (about) in or as if in a dream
12.  to consider the possibility (of): I wouldn't dream of troubling you
13.  too good to be true; ideal: dream kitchen
Related: oneiric
[Old English drēam song; related to Old High German troum, Old Norse draumr, Greek thrulos noise]
n, —adj

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

mid-13c. in the sense "sequence of sensations passing through a sleeping person's mind" (also as a verb), probably related to O.N. draumr, Dan. drøm, Swed. drom, O.S. drom, Du. droom, O.H.G. troum, Ger. traum "dream," perhaps from W.Gmc. *draugmas "deception, illusion, phantasm" (cf. O.S. bidriogan,
O.H.G. triogan, Ger. trügen "to deceive, delude," O.N. draugr "ghost, apparition"). Possible cognates outside Gmc. are Skt. druh- "seek to harm, injure," Avestan druz- "lie, deceive." But O.E. dream meant only "joy, mirth," also "music." Words for "sleeping vision" in O.E. were mæting and swefn (from PIE *swep-no-; cf. Gk. hypnos). Much study has failed to prove that O.E. dream "noisy merriment" is the root of the modern word for "sleeping vision," despite being identical in spelling. Either the meaning of the word changed dramatically or "vision" was an unrecorded secondary O.E. meaning of dream, or there are two separate words here. "It seems as if the presence of dream 'joy, mirth, music,' had caused dream 'dream' to be avoided, at least in literature, and swefn, lit. 'sleep,' to be substituted" [OED]. Dream in the sense of "ideal or aspiration" is from 1931, from earlier sense of "something of dream-like beauty or charm" (1888). Related: Dreamed; dreaming.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dream (drēm)
A series of images, ideas, emotions, and sensations occurring involuntarily in the mind during certain stages of sleep.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Bible Dictionary

Dream definition

God has frequently made use of dreams in communicating his will to men. The most remarkable instances of this are recorded in the history of Jacob (Gen. 28:12; 31:10), Laban (31:24), Joseph (37:9-11), Gideon (Judg. 7), and Solomon (1 Kings 3:5). Other significant dreams are also recorded, such as those of Abimelech (Gen. 20:3-7), Pharaoh's chief butler and baker (40:5), Pharaoh (41:1-8), the Midianites (Judg. 7:13), Nebuchadnezzar (Dan. 2:1; 4:10, 18), the wise men from the east (Matt. 2:12), and Pilate's wife (27:19). To Joseph "the Lord appeared in a dream," and gave him instructions regarding the infant Jesus (Matt. 1:20; 2:12, 13, 19). In a vision of the night a "man of Macedonia" stood before Paul and said, "Come over into Macedonia and help us" (Acts 16:9; see also 18:9; 27:23).

Easton's 1897 Bible Dictionary
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