(often initial capital letter) the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93 million miles (150 million km), its diameter about 864,000 miles (1.4 million km), and its mass about 330,000 times that of the earth; its period of surface rotation is about 26 days at its equator but longer at higher latitudes.
the sun considered with reference to its position in the sky, its visibility, the season of the year, the time at which or the place where it is seen, etc.
a self-luminous heavenly body; star.
sunshine; the heat and light from the sun: to be exposed to the sun.
a figure or representation of the sun, as a heraldic bearing usually surrounded with rays and marked with the features of a human face.
something likened to the sun in brightness, splendor, etc.
Chiefly Literary.
clime; climate.
glory; splendor.
sunrise or sunset: They traveled hard from sun to sun.
a day.
a year.
verb (used with object), sunned, sunning.
to expose to the sun's rays.
to warm, dry, etc., in the sunshine.
to put, bring, make, etc., by exposure to the sun.
verb (used without object), sunned, sunning.
to be exposed to the rays of the sun: to sun in the yard.
against the sun, Nautical. counterclockwise.
place in the sun, a favorable or advantageous position; prominence; recognition: The new generation of writers has achieved a place in the sun.
under the sun, on earth; anywhere: the most beautiful city under the sun.
with the sun, Nautical. clockwise.

before 900; Middle English sun, sonne, Old English sunne; cognate with German Sonne, Old Norse sunna, Gothic sunno; akin to Old Norse sōl, Gothic sauil, Latin sōl (see solar), Greek hḗlios (see helio-), Welsh haul, Lithuanian saũlė, Polish słońce

sunlike, adjective Unabridged


Also, Sund. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sun (sʌn)
1.  the star at the centre of our solar system. It is a gaseous body having a highly compressed core, in which energy is generated by thermonuclear reactions (at about 15 million kelvins), surrounded by less dense radiative and convective zones serving to transport the energy to the surface (the photosphere). The atmospheric layers (the chromosphere and corona) are normally invisible except during a total eclipse. Mass and diameter: 333 000 and 109 times that of earth respectively; mean distance from earth: 149.6 million km (1 astronomical unit)Related: solar
2.  any star around which a planetary system revolves
3.  the sun as it appears at a particular time or place: the winter sun
4.  the radiant energy, esp heat and light, received from the sun; sunshine
5.  a person or thing considered as a source of radiant warmth, glory, etc
6.  a pictorial representation of the sun, often depicted with a human face
7.  poetic a year or a day
8.  poetic a climate
9.  archaic sunrise or sunset (esp in the phrase from sun to sun)
10.  catch the sun to become slightly sunburnt
11.  place in the sun a prominent or favourable position
12.  nautical shoot the sun, take the sun to measure the altitude of the sun in order to determine latitude
13.  touch of the sun slight sunstroke
14.  under the sun, beneath the sun on earth; at all: nobody under the sun eats more than you do
vb , suns, sunning, sunned
15.  to expose (oneself) to the sunshine
16.  (tr) to expose to the sunshine in order to warm, tan, etc
Related: solar
[Old English sunne; related to Old High German sunna, Old Frisian senne, Gothic sunno]

abbreviation for

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

O.E. sunne, from P.Gmc. *sunnon (cf. O.N., O.S., O.H.G. sunna, M.Du. sonne, Du. zon, Ger. Sonne, Goth. sunno), from PIE *s(u)wen- (cf. Avestan xueng "sun," O.Ir. fur-sunnud "lighting up"), alternative form of base *saewel- "to shine, sun" (see Sol). O.E. sunne was fem., and
the fem. pronoun was used until 16c.; since then masc. has prevailed. The empire on which the sun never sets (1630) originally was the Spanish, later the British. To have one's place in the sun (1680s) is from Pascal's "Pensées"; the Ger. imperial foreign policy sense (1897) is from a speech by von Bülow. The U.S. Sunbelt is first recorded 1969. Sunlight is first recorded c.1200. Sunbeam was in O.E.; sunset first recorded 1390 (sundown is from 1620); sunrise is first found mid-15c. (sun-up is from 1712). Sundial is from 1590s. Sunspot in ref. to the solar phenomenon is from 1868. Egg served sunny side up first attested 1900. Sunroof of a car is from 1966.

1519, "to set something in the sun," from sun (n.). Meaning "to expose oneself to the sun" is recorded from 1610. Sun-bathing is attested from 1600. Sun-tan (v.) is recorded from 1821; the noun is first attested 1904. Sunburn (v.) is from sunne y-brent (c.1400).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sun   (sŭn)  Pronunciation Key 

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Often Sun. A medium-sized, main-sequence star located in a spiral arm of the Milky Way galaxy, orbited by all of the planets and other bodies in our solar system and supplying the heat and light that sustain life on Earth. Its diameter is approximately 1.4 million km (868,000 mi), and its mass, about 330,000 times that of Earth, comprises more than 99 percent of the matter in the solar system. It has a temperature of some 16 million degrees C (27 million degrees F) at its core, where nuclear fusion produces tremendous amounts of energy, mainly through the series of reactions known as the proton-proton chain. The energy generated in the core radiates through a radiation zone to an opaque convection zone, where it rises to the surface through convection currents of the Sun's plasma. The Sun's surface temperature (at its photosphere) is approximately 6,200 degrees C (11,200 degrees F). Turbulent surface phenomena analogous to the Earth's weather are prevalent, including magnetic storms, sunspots, and solar flares. The Sun was formed along with the rest of the solar system about 4.5 billion years ago and is expected to run out of its current hydrogen fuel in another 5 billion years, at which point it will develop into a red giant and ultimately into a white dwarf. See Table at solar system. See Note at dwarf star.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

sun definition

The star around which the Earth revolves.

Note: The sun is about 4.5 billion years old and is expected to remain in its present state for approximately another six billion years; it will eventually evolve into a white dwarf.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

Sun definition

Sun Microsystems
The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Bible Dictionary

Sun definition

(Heb. shemesh), first mentioned along with the moon as the two great luminaries of heaven (Gen. 1:14-18). By their motions and influence they were intended to mark and divide times and seasons. The worship of the sun was one of the oldest forms of false religion (Job 31:26,27), and was common among the Egyptians and Chaldeans and other pagan nations. The Jews were warned against this form of idolatry (Deut. 4:19; 17:3; comp. 2 Kings 23:11; Jer. 19:13).

Easton's 1897 Bible Dictionary
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American Heritage
Idioms & Phrases


In addition to the idiom beginning with sun, also see everything but the kitchen sink (under the sun); make hay while the sun shines; nothing new under the sun; place in the sun.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
As the sun emerges from a long lull in activity, the star's emissions in the
  radio band of the spectrum have also picked up.
Most extrasolar planets have been revealed by observing their host star, or sun.
Still, it looks as if he's going to enjoy his moment in the sun.
The parents were concerned about the safety of the park because the sun shines
  into the eyes of the pitcher.
Images for sun
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