period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"

day, mean solar day, solar day, twenty-four hours - time for Earth to make a complete rotation on its axis; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day"

weeknight - any night of the week except Saturday or Sunday

evening - the early part of night (from dinner until bedtime) spent in a special way; "an evening at the opera"

late-night hour - the latter part of night

midnight - 12 o'clock at night; the middle of the night; "young children should not be allowed to stay up until midnight"

small hours - the hours just after midnight

lights-out - a prescribed bedtime

wedding night - the night after the wedding when bride and groom sleep together

nocturnal - belonging to or active during the night; "nocturnal animals are active at night"; "nocturnal plants have flowers that open at night and close by day"