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"

forenoon, morn, morning, morning time - the time period between dawn and noon; "I spent the morning running errands"

afternoon - the part of the day between noon and evening; "he spent a quiet afternoon in the park"

midafternoon - the middle part of the afternoon

evening, eventide, eve - the latter part of the day (the period of decreasing daylight from late afternoon until nightfall); "he enjoyed the evening light across the lake"

diurnal - belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night"