'skylight' originates from Middle English, specifically the words 'sky' and 'light', where 'sky' referred to the heavens or the atmosphere, and 'light' referred to illumination.

'skylight' changed from the Middle English words 'sky' and 'light' and eventually became the modern English word 'skylight'.

Initially, it meant 'a window in the roof for light', and this meaning has largely remained the same in modern usage.