Main Entry: day

Pronunciation: \ˈdā\

Function: noun

Etymology: Middle English, from Old English dæg; akin to Old High German tag day

Date: before 12th century

1 a : the time of light between one night and the next b : daylight 1 c : daytime
2 : the period of rotation of a planet (as earth) or a moon on its axis
3 : the mean solar day of 24 hours beginning at mean midnight
4 : a specified day or date
5 : a specified time or period : age <in grandfather's day> —often used in plural <the old days> <the days of sailing ships>
6 : the conflict or contention of the day <played hard and won the day>
7 : the time established by usage or law for work, school, or business

— day after day : for an indefinite or seemingly endless number of days

— day in, day out : for an indefinite number of successive days