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The Patriation of the Constitution in 1982 was a key element of the Constitution Act of the same year.
Its main purpose was to ensure that Canada could modify its own constitution without needing approval from the Crown of the United Kingdom.
In other words, it meant that Canada became a fully independent state, capable of making all of its own political decisions.
I hope that helps you !

In 1982, Canada “patriated” its Constitution. It transferred the country’s highest law, the British North America Act (which was renamed the Constitution Act, 1867), from the authority of the British Parliament to Canada’s federal and provincial legislatures. The Constitution was also updated with a new amending formula and a Charter of Rights and Freedoms. These changes occurred after a fierce, 18-month political and legal struggle that dominated headlines and the agendas of every government in the country.
-The Canadian Encyclopedia
This has a lot of information:
https://thecanadianencyclopedia.ca/en/article/patriation-of-the-constitution
(if the link works)