1. noun /ˈkæl.ən.də,ˈkæl.ən.dɚ/
We currently use the Gregorian calendar.
b) A means to determine the date consisting of a document containing dates and other temporal information.
The club has a busy calendar this year.
2. verb /ˈkæl.ən.də,ˈkæl.ən.dɚ/
To set a date for a proceeding in court, usually done by a judge at a calendar call.
The judge agreed to calendar a hearing for pretrial motions for the week of May 15, but did not agree to calendar the trial itself on a specific date.
Wikipedia foundation.