noun see: solar Date: 1617 exposure to the sun's rays, sunstroke , 3. solar radiation that has been received, the rate of delivery of direct solar radiation per unit of horizontal surface
INSOLATION
Meaning of INSOLATION in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012