1 [in-soh-ley-shuhn]
exposure to the sun's rays, especially as a process of treatment.

1605–15; < Latin insōlātiōn- (stem of insōlātiō). See insolate, -ion Unabridged


2 [in-soh-ley-shuhn]
noun Meteorology.
solar radiation received at the earth's surface.

in(coming) sol(ar radi)ation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insolation (ˌɪnsəʊˈleɪʃən)
1.  the quantity of solar radiation falling upon a body or planet, esp per unit area
2.  exposure to the sun's rays
3.  former name for sunstroke

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
insolation   (ĭn'sō-lā'shən)  Pronunciation Key 
  1. The solar radiation striking Earth or another planet.

  2. The rate of delivery of solar radiation per unit of horizontal surface.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
My understanding is that ocean salinity is more dependent on net water flux than insolation.
The insolation values represent the resource available to concentrating systems that track the sun throughout the day.
Insolation models have proliferated to the point where it is difficult for a solar user to decide which model to adopt.
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