From Middle English daye-lighte, dey liȝht, dailiȝt, day-liht, dai-liht (also as days lyȝt, daies liht), equivalent to day + light. Cognate with Saterland Frisian Deegeslucht, Daisljoacht (“daylight”), West Frisian deiljocht (“daylight”), Dutch daglicht (“daylight”), German Tageslicht (“daylight”).
daylight (countable and uncountable, plural daylights)
- The light from the Sun, as opposed to that from any other source.
- A light source that simulates daylight.
- (countable, photometry) The intensity distribution of light over the visible spectrum generated by the Sun under various conditions or by other light sources intended to simulate natural daylight.
- The period of time between sunrise and sunset.
We should get home while it's still daylight.
We had only two hours to work before daylight.
- Exposure to public scrutiny.
Budgeting a spy organization can't very well be done in daylight.
- A clear, open space.
All small running backs instinctively run to daylight.
He could barely see daylight through the complex clockwork.
Finally, after weeks of work on the project, they could see daylight.
- (countable, machinery) The space between platens on a press or similar machinery.
The minimum and maximum daylights on an injection molding machine determines the sizes of the items it can make.
- (idiomatic) Emotional or psychological distance between people, or disagreement.
We completely agree. There's no daylight between us on the issue.
- The gap between the top of a drinking-glass and the level of drink it is filled with.
- Coordinate term: heeltap
light source that simulates daylight
photometry: natural daylight's intensity distribution of light over the visible spectrum
period of time between sunrise and sunset
exposure to public scrutiny
motional or psychological distance between people
- (gap between glass and drink): 1873, John Camden Hotten, The Slang Dictionary
daylight (third-person singular simple present daylights, present participle daylighting, simple past and past participle daylighted or daylit)
- To expose to daylight
- 1895, H. G. Wells, The Time Machine, Chapter 7, 
- […] the Morlocks, subterranean for innumerable generations, had come at last to find the daylit surface intolerable.
- 1953, C. S. Lewis, The Silver Chair, Collins, 1998, Chapter 15,
- […] she was not looking at the daylit, sunny world which she so wanted to see.
- (architecture) To provide sources of natural illumination such as skylights or windows.
- To allow light in, as by opening drapes.
- (landscaping, civil engineering) To run a drainage pipe to an opening from which its contents can drain away naturally.
- (intransitive) To gain exposure to the open.
- The seam of coal daylighted at a cliff by the river.