- nighttime - happening during or appropriate to the night; "nighttime attire"; "the cat's nighttime prowls"
Antonym: daytime
- night, nighttime, dark - the time after sunset and before sunrise while it is dark outside
--1 is a kind of time period, period of time, period
--1 is a part of day, twenty-four hours, solar day, mean solar day
--1 has parts:
--1 has particulars: weeknight; wedding nightevening; late-night hour; midnight; small hours; lights-out