As a Noun: 1. The act of becoming unable to be seen or experienced by going somewhere else, by changing in some way, or by becoming smaller and smaller or less and less. English = disappearance. 2. The act of stopping something happening. English = cancellation. 3. A ticket or a booking that is no longer wanted. English = cancellation. 4. The end of existence of things of a particular type, especially species of animals, after they have become less and less common. English = extinction. As a Verb or Adjective: 1. To become unable to be seen or experienced by going somewhere else, by changing in some way, or by becoming smaller and smaller or less and less. English = disappear, vanish, go away. 2. To stop something happening that has been arranged to happen; of a prearranged event, to be no longer happening. English = cancel; (be) cancelled, (be) off. 3. Of a ticket to the theatre or a booking for a hotel room, to tell the management that you no longer want the seat or the room. English = cancel. 4. Of things of a particular type, especially species of animals, to become less and less common until something no longer exists. English = become extinct, die out.