English

Noun

forty-ninth parallel ‎(uncountable)

1. (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.
2. (Canada, US, nonstandard) A nickname for the entire border between Canada and the USA.

References

• forty-ninth parallel at OneLook Dictionary Search