Decoherence meaning

(physics) The process by which a quantum system interacts with its environment in such a way that no interference between states of the system can be observed.
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(engineering) The normal condition of sensitiveness in a coherer (disused).
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Origin of decoherence

First attested 1902 (OED), in the context of electrical engineering, in the sense of the resetting of a coherer. Decoherence is the verbal noun, standing besides decohesion, derived from decohere (also attested from 1902), the de- negative of cohere (17th century).