Other forms: daylights
Daylight is the natural light of the day. In broad daylight, before daylight, daylight hours.
It is far brighter than any indoor lighting — tens of thousands of lux outdoors against a few hundred inside — which is why getting outside in the morning matters for the body clock. Daylight robbery means an outrageous price. Note the compound of day and light.
1noundaylightThe natural light of the day.
“Let's finish the hike while there's still daylight.”
daylight is light.
Day plus light. The compound is recorded from Middle English and has never changed its meaning.
Middle English
daye-lighte
English, today
daylight
From Middle English daye-lighte, dey liȝht, dailiȝt, day-liht, dai-liht (also as days lyȝt, daies liht), equivalent to day + light. Cognate with stq Deegeslucht, Daisljoacht (“daylight”), West Frisian deiljocht (“daylight”), Dutch daglicht (“daylight”), German Tageslicht (“daylight”).
Etymology from Wiktionary, CC BY-SA