disappearance
n. C / Un. the act of someone or something going away so they cannot be seen or found. It can also mean when something stops existing entirely.
n. the act or fact of vanishing from sight or existence. Refers to the process of becoming lost, hidden, or extinct.
The sudden disappearance of my keys is very frustrating.
Police are still investigating the mysterious disappearance of the hiker who vanished from the trail last Tuesday.
The rapid disappearance of traditional wetlands has led to a significant decline in local bird populations, prompting urgent calls for environmental protection.
From disappear + -ance.
Uncountable when referring to the general concept of vanishing; countable when referring to a specific instance or event.
the disappear of the sunthe disappearance of the sunLearners often mistakenly use the verb 'disappear' where the noun form 'disappearance' is required.