What does the word 'cancel' mean?

Question

Question ATPL - Airline Transport Pilot license - IFR Communications

QuizVDS · Accepted Answer

Annul the previously transmitted clearance

QuizVDS · Answer

A change has been made to your last clearance

QuizVDS · Answer

Wait and I will call you

QuizVDS · Answer

Consider that transmission as not sent

Id 31 - ATPL - What does the word 'cancel' mean?