disappearance
🇺🇸
/ˌdɪsəˈpɪrəns/
🇬🇧
/ˌdɪsəˈpɪərəns/
when someone or something is lost and cannot be found
The disappearance of the child worried everyone in the town.
when something stops existing or can no longer be seen
The disappearance of the sun behind the clouds made the day dark.