the light that comes from the sun during the day They emerged from the church into the bright daylight. The street looks very different in daylight. They left before daylight (= before the sun had risen). The bridge would be a prime target for enemy aircraft during daylight hours.
Idioms (in) the clear light of day, when it is easy to see The robbery occurred in broad daylight, on a crowded street. See daylight in the Oxford Advanced Learner's Dictionary