Meaning : Some point or period in time.
It should arrive any day now.
After that day she never trusted him again.
Those were the days.
These days it is not unusual.
Meaning : A day assigned to a particular purpose or observance.
Meaning : The recurring hours when you are not sleeping (especially those when you are working).
My day began early this morning.
It was a busy day on the stock exchange.
She called it a day and went to bed.
Meaning : An era of existence or influence.
In the day of the dinosaurs.
In the days of the Roman Empire.
In the days of sailing ships.
He was a successful pianist in his day.
Meaning : 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?.
Meaning : The time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day.
Synonyms : sidereal day
Meaning : A period of opportunity.
He deserves his day in court.
Every dog has his day.