Refers to the practice of designing a space (placement of openings, implementation of reflective systems, etc.) in such a way that natural light can provide suitable illumination.

Daylighting is the deliberate provision of natural light during the day from the sky into occupied spaces through apertures on the external building envelope to enhance spatial qualities and improve the well-being and performance of its occupants.

Daylighting is the provision of an enclosed space that maintains a proportion of luminance of what is to be seen and the light sources of that space - the sky, the outdoor (albedo) and perhaps the sun as seen (or diffusely perceived) throught apertures (doors, windows and skylights).