daytime
Word family
Synonym discussion
Sense: noun/1
Daytime, daylight, and day all relate to the 24-hour cycle but differ in scope. Daytime (B2) is the period when the sun is up — it contrasts with nighttime and is used in fixed phrases like 'during the daytime' or 'in the daytime.' Daylight (B2) focuses on the natural light pouring from the sun: 'we lost daylight as the storm rolled in.' Day (A1) is broader — it can mean the 24-hour calendar unit ('I saw her two days ago'), the daytime period ('I worked all day'), or a historical era ('in those days'). Use daytime when you mean the light hours specifically, daylight when the quality or presence of light matters, and day when the context is calendar time or a general contrast with night.
Common collocations
Etymology
Daytime comes from Old English dægtīma, a straightforward compound of dæg ('day') and tīma ('time'). The word has kept the same form and meaning for more than a thousand years, which is unusual for English vocabulary.