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
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