- Noun. Exposure to the rays of the sun.
- Noun. (meteorology) The incident radiant energy emitted by the sun which reaches a unit horizontal area of the Earth's surface; the rate of delivery of such radiation.
- Noun. The act or process to exposing to the rays of the sun for the purpose of drying or maturing, as fruits, drugs, etc., or of rendering acid, as vinegar.
- Noun. (medicine) sunstroke.
- Noun. (medicine) A sun bath.