Source : Webster's Revised Unabridged Dictionary (1913)

Insolation \In`so*la"tion\, n. [L. insolatio: cf. F.
   insolation.]
   1. The act or process to exposing to the rays of the sun fro
      the purpose of drying or maturing, as fruits, drugs, etc.,
      or of rendering acid, as vinegar.

   2. (Med.)
      (a) A sunstroke.
      (b) Exposure of a patient to the sun's rays; a sun bath.

Source : WordNet®

insolation
     n 1: sudden prostration due to exposure to the sun or excessive
          heat [syn: {sunstroke}, {thermic fever}, {siriasis}]
     2: incident solar radiation
     3: therapeutic exposure to sunlight [syn: {heliotherapy}]