derealization
noun
de·re·al·i·za·tion
(ˌ)dē-ˌrē-ə-lə-ˈzā-shən
: a feeling of altered reality (such as that occurring in schizophrenia or in some drug reactions) in which one's surroundings appear unreal or unfamiliar
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Merriam-Webster unabridged
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