Radiant energy with a relative spectral distribution defined over the wavelength range that influences object colour perception.
Note: In English, this term is not restricted to this sense, but is a general term used for any kind of light falling on a body or scene, and is also used to refer to the light source itself, including its filters if any.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM