Definitions for "Nighttime"
Keywords:  sunrise, sunset, analyses, hour, half
the time beginning one half hour after sunset and ending one half hour before sunrise the following day.
the time after sunset and before sunrise while it is dark outside
The period that starts a half hour before sunset and ends a half hour after sunrise.
happening during or appropriate to the night; "nighttime attire"; "the cat's nighttime prowls"
Keywords:  dusk, daytime, dawn, opposed, time
The time from dusk to dawn; -- opposed to daytime.