1 [soh-ler]
of or pertaining to the sun: solar phenomena.
determined by the sun: solar hour.
proceeding from the sun, as light or heat.
utilizing, operated by, or depending on solar energy: a solar building; a solar stove.
indicating time by means of or with reference to the sun: a solar chronometer.
manufacturing or providing solar power: the solar industry.
Astrology. subject to the influence of the sun.
Informal. solar energy.

1400–50; late Middle English < Latin sōlāris, equivalent to sōl sun + -āris -ar1 Unabridged


2 [sol-er, soh-ler]
a private or upper chamber in a medieval English house.
Also, sollar, soller.

before 900; Middle English solar, soler < Anglo-French soler, Old French solier < Latin sōlārium solarium; compare Old English solor, soler, Middle Dutch solre loft < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
solar (ˈsəʊlə)
1.  of or relating to the sun: solar eclipse
2.  operating by or utilizing the energy of the sun: solar cell
3.  astronomy determined from the motion of the earth relative to the sun: solar year
4.  astrology subject to the influence of the sun
[C15: from Latin sōlāris, from sōl the sun]

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

c.1450, from L. solaris "of the sun," from sol "sun" (see sol). Meaning "living room on an upper story" is from O.E., from L. solarium (see solarium). Solar power is attested from 1915. Solar system is attested from c.1704. Solar plexus (1771)
"complex of nerves in the pit of the stomach," apparently so called from its central position in the body.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
solar   (sō'lər)  Pronunciation Key 
  1. Relating to the Sun.

  2. Using or operated by energy from the Sun.

  3. Measured in reference to the Sun.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


in architecture, private room located on the floor above the great hall in a late medieval English manor house. The solar served as a kind of parlour to which the family of the owner of the manor house or castle could retire from the bustling communal living of the hall below. In fact, by the late 14th century the solar was more often called the "retiring room." Up a flight of stairs from the dais, or platform, end of the hall, the solar usually had an adjacent chapel.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
More questions arise than are answered with each new mission to other bodies
  within our own solar system.
Solar cells are still ten times too expensive for use in housing.
Solar energy warms the water in swimming pools, heats homes and can be
  converted into electricity.
Following the collapse of the ballyhooed solar firm, these are dark times for
  renewable energy.
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