- n. 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.
- n. Canada, US, nonstandard A nickname for the entire border between Canada and the USA.
“Its northern boundary line, which divides it from Canada, extends along the forty-ninth parallel from meridian 27 west of Washington”
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