▪ an act or the fact of someone or something going missing: "the police were investigating her disappearance"SimilarlosstheftrobberystealingthievingrobbingpilferingpilferagepurloiningOppositerecovery
▪ the process of something ceasing to exist or be in use:"the disappearance of grammar schools"Similardying outdyingdeathextinctioncoming to an endendingpassing awaypassing into oblivionexpiryvanishingperishingwithering awaypetering outfizzling out