Fetching details from the dictionary...

cancellation (of a lecture, class, etc.)
先生が病気なので今日の授業は休講だ。
Today's class is cancelled because the teacher is sick.
台風で電車が止まったため休講になった。
Classes were cancelled because the trains stopped due to the typhoon.
休講の通知がメールで届いて助かった。
I was relieved to receive the class cancellation notice by email.