in·​so·​la·​tion | \ ˌin-(ˌ)sō-ˈlā-shən How to pronounce insolation (audio) \

Definition of insolation

1 : exposure to the sun's rays
2 : sunstroke
3a : solar radiation that has been received
b : the rate of delivery of direct solar radiation per unit of horizontal surface broadly : that relating to total solar radiation

Examples of insolation in a Sentence

Recent Examples on the Web The drill core reveals that the climate of East Africa was largely influenced by changes in solar insolation, which led to either wet or dry climate conditions. David Bressan, Forbes, 16 June 2021 His concerns over the growing realities of global warming led to a controversial foray into theoretical geoengineering, proposing injection of sulfur gases into the atmosphere to reduce insolation. Colin Waters, Scientific American, 5 Feb. 2021 The same thing happens in summer — there’s a delay between when solar insolation is at its maximum (the summer solstice in June) and when the hottest months are (usually July or August). Brian Resnick, Vox, 18 Dec. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'insolation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of insolation

1617, in the meaning defined at sense 1

History and Etymology for insolation

French or Latin; French, from Latin insolation-, insolatio, from insolare to expose to the sun, from in- + sol sun — more at solar

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Time Traveler for insolation

Time Traveler

The first known use of insolation was in 1617

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Statistics for insolation

Last Updated

18 Jun 2021

Cite this Entry

“Insolation.” Dictionary, Merriam-Webster, Accessed 21 Jun. 2021.

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More Definitions for insolation


in·​so·​la·​tion | \ ˌin(t)-(ˌ)sō-ˈlā-shən, in-ˌsō- How to pronounce insolation (audio) \

Medical Definition of insolation

1 : exposure to the rays of the sun
2 : sunstroke


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