Definition of day and night
- We've been working on it day and night.
- The difference between them is night and day.
: the time of light between one night and the next
: the time from dusk to dawn when no sunlight is visible
: an evening or night taken as an occasion or point of time
: an evening set aside for a particular purpose
: of, relating to, or associated with the night
: intended for use at night
: existing, occurring, or functioning at night
What made you want to look up day and night? Please tell us where you read or heard it (including the quote, if possible).