(~s)
1.
A ~ is a chart or device which displays the date and the day of the week, and often the whole of a particular year divided up into months, weeks, and days.
There was a ~ on the wall above, with large squares around the dates.
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2.
A ~ is a particular system for dividing time into periods such as years, months, and weeks, often starting from a particular point in history.
The Christian ~ was originally based on the Julian ~ of the Romans.
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3.
You can use ~ to refer to a series or list of events and activities which take place on particular dates, and which are important for a particular organization, community, or person.
It is one of the British sporting ~’s most prestigious events...
= diary
N-COUNT: usu sing, usu with poss