1.time for Earth to make a complete rotation on its axis;
two days later they left
2.some point or period in time;
it should arrive any day now
3.the time after sunrise and before sunset while it is light outside;
the dawn turned night into day
4.a day assigned to a particular purpose or observance;
Mother's Day
5.the recurring hours when you are not sleeping (especially those when you are working);
my day began early this morning
6.an era of existence or influence;
in the day of the dinosaurs
7.a period of opportunity;
he deserves his day in court
8.the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis;
how long is a day on Jupiter?
9.the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day