"We have taken a crucial step forward in strengthening relations between the European Union and Canada," the European Commission said while Canadian Prime Minister Stephen Harper hailed "the biggest (trade) deal our country has ever made."
"This is a highly ambitious and far-reaching trade agreement of great importance for the EU's economy," said Commission head Jose Manuel Barroso.
It would provide new opportunities for companies in the EU and in Canada by increasing market access and "be the basis for gaining a strong foothold in the North American market and so provide a catalyst for growth and the creation of jobs in Europe," he said.
Harper said the agreement in principle with Brussels -- there remain technical details to be resolved -- was "the most important ... And most ambitious ever" for his country.
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"It is not just a good deal, it is an excellent deal," he added.
It will give Canada access to a market of some 500 million people in the EU, making it bigger even than the landmark North American Free Trade Agreement (NAFTA) with the United States and Mexico.
Barroso, noting the deal was the EU's first with a Group of Eight country, said it could increase trade by up to 26 billion euros in time and add 12 billion euros annually to EU economic output.