day

noun

1.
2.
a point or period in time
3.
a day assigned to a particular purpose or observance
onday
4.
the time after sunrise and before sunset while it is light outside
daylight daytime
Antonym:
night
5.
the recurring hours when you are not sleeping (especially those when you are working)
6.
an era of existence or influence
lifeday Truefrith
7.
the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis
8.
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
sidereal day
9.
a period of opportunity