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patriation

n. (context Canada English) The transfer of a governmental power from a former mother country to a newly independent one.

Wikipedia
Patriation

Patriation was the political process that led to Canadian sovereignty, culminating in 1982. Until that date, Canada was governed by a constitution composed of British laws that could be changed only by acts of the British parliament, albeit only with the consent of the Canadian government.

The patriation process saw the provinces granted influence in constitutional matters and resulted in the constitution being amendable by Canada only and according to the Canadian amending formula, with no role for the Parliament of the United Kingdom. Hence, patriation is associated with the acquisition of full sovereignty.