[sol-stis, sohl-]
either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or about December 22, when it reaches its southernmost point. Compare summer solstice, winter solstice.
either of the two points in the ecliptic farthest from the equator.
a furthest or culminating point; a turning point.

1200–50; < Middle English < Old French < Latin sōlstitium, equivalent to sōl sun + -stit-, combining form of stat-, variant stem of sistere to make stand (see stand) + -ium -ium; see -ice) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
solstice (ˈsɒlstɪs)
1.  either the shortest day of the year (winter solstice) or the longest day of the year (summer solstice)
2.  either of the two points on the ecliptic at which the sun is overhead at the tropic of Cancer or Capricorn at the summer and winter solstices
[C13: via Old French from Latin sōlstitium, literally: the (apparent) standing still of the sun, from sōl sun + sistere to stand still]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-13c., from O.Fr. solstice, from L. solstitium "point at which the sun seems to stand still," from sol "sun" (see sol) + pp. stem of sistere "to come to a stop, make stand still" (see assist).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
solstice   (sŏl'stĭs, sōl'-)  Pronunciation Key 
  1. Either of the two points on the celestial sphere where the ecliptic (the apparent path of the Sun) reaches its greatest distance north or south of the celestial equator. ◇ The northernmost point of the Sun's path, called the summer solstice, lies on the Tropic of Cancer at 23°27' north latitude. ◇ The southernmost point of the Sun's path, called the winter solstice, lies on the Tropic of capricorn at 23°27' south latitude.

  2. Either of the two corresponding moments of the year when the Sun is directly above either the Tropic of Cancer or the Tropic of Capricorn. The summer solstice occurs on June 20 or 21 and the winter solstice on December 21 or 22, marking the beginning of summer and winter in the Northern Hemisphere (and the reverse in the Southern Hemisphere). The days on which a solstice falls have the greatest difference of the year between the hours of daylight and darkness, with the most daylight hours at the beginning of summer and the most darkness at the beginning of winter. Compare equinox.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
solstice [(sol-stuhs, sohl-stuhs)]

The two occasions each year when the position of the sun at a given time of day does not seem to change direction. In the Northern Hemisphere, the summer solstice occurs around June 21 and is the longest day of the year. The sun stops getting higher in the sky, and the days begin to grow shorter. The winter solstice, which occurs around December 21, is the shortest day. The sun stops getting lower in the sky, and the days begin to grow longer.

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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Example sentences
No better time to get the answers to these questions than now, the week of the
  summer solstice.
In modern times, the solstice points became the astronomical definitions of
  when the summer and winter seasons begin.
The winter solstice is, of course, the shortest day of the year.
Tonight's lunar eclipse coincides with the winter solstice.
Image for solstice
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