noun

• (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.
• (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."
• (figurative) Emotional or psychological distance between people, or disagreement.
  "We completely agree. There's no daylight between us on the issue."
• (figurative) Meaningful or noticeable difference or distinction between two things, especially concepts.
  "There's not much daylight between saying that the universe is God and saying that God doesn't exist."

verb

• (architecture) To provide sources of natural illumination such as skylights or windows.
• (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."