nautical mile

This term is a specialized technical unit used primarily in maritime, aviation, and aerospace contexts. It differs from the statute mile used on land, as it is based on the circumference of the Earth rather than a fixed terrestrial distance. Because it represents one minute of latitude, it is the standard for global navigation and charting.

In professional communication, it is often abbreviated as nm or nmi to avoid confusion with statute miles. Using this term in a non-navigational context would be considered highly unusual or overly precise.