A state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently WordNet 3.0 & Open English WordNet

Dissociation is a concept that has been developed over time and which concerns a wide array of experiences, ranging from a mild emotional detachment from the immediate surroundings, to a more severe disconnection from physical and emotional experiences. Wikipedia

An experience of having one's attention and emotions detached from the environment Wikipedia Disambiguation

Mild detachment from immediate surroundings to more severe detachment from physical and emotional experience Wikidata

The act of dissociating or disuniting; a state of separation; disunion. Wiktionary

Act of dissociating. Wiktionary (translation)