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In Canadian and U.S. american usage, one trillion equals 1,000,000,000,000, or 1012, or one million millions. An american trillion equals a european billion.

In Europe, one trillion equals 1,000,000,000,000,000,000, or 1018, or one million million millions. A European trillion equals an American quintillion.

Britain and Australia traditionally used the European version, but have recently largely switched to the U.S. usage.

See also: number names