To remove someone or something from an official record, registry, or list; to cancel a registration or formal enrollment.
From 'de-' (to remove) plus 'register,' following standard English word formation patterns for reversing actions, used in legal and administrative contexts since at least the early 20th century.
Deregistration is like undoing a promise to the government—it's surprisingly complicated because bureaucracies keep multiple records, so one deregistration might require paperwork in five different offices.
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