can‧cel‧la‧tion [uncountable and countable]
a decision that an event that was planned will not happen:
Rail passengers are fed up with cancellations and delays.
Bad weather led to the cancellation of the game.
a decision to end an agreement or arrangement that you have with someone:
There is a cancellation fee of £20.
The hotel is fully booked, but we will let you know if there are any cancellations.