Existing light surrounding a subject; the light that is illuminating a scene without any additional light supplied by the photographer. “Ambient light” and “existing light” are two other terms that me [..]

Light of almost any sort which exists and has not been introduced to record images. Its use is sometimes fast, cheap, and even beautiful. Tip: The more you understand lighting technique, the better prepared you will be to take advantage of the good stuff - when it is available. Before committing, what are the odds that it will last as long as your [..]

At an off-set location, this is the light that is naturally available. Shots are more realistic when natural light is used rather than artificial light.

the naturally-existing light in an off-set location; a film's realism is enhanced by using available or natural light rather than having artificial light.  

The light that's normal in a scene, although the term is generally used when the light level is low. Available light shooting usually involves fast film, low shutter speeds and apertures, and/or the use of a tripod.

  a term used for shooting without film lighting, using only the light available in the natural surroundings.

Any naturally occurring light which illuminates a scene that isn't provided by the photographer, e.g. the sun, the moon, building light, or other light source.

term applying to light normally occurring in a scene, not supplemented by illumination intended specifically for photography.