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Definition of Forty-ninth parallel
1. Noun. (Canada US) A nickname for the approximately 1200-mile (1900-kilometer) portion of the border between Canada and the USA, extending along the forty-ninth parallel of latitude from Lake of the Woods to the Pacific Ocean. ¹
2. Noun. (Canada US nonstandard) A nickname for the entire border between Canada and the USA. ¹
¹ Source: wiktionary.com