Relating to or characteristic of the Mercator projection, a type of map projection introduced by Gerardus Mercator in 1569, which represents the globe on a flat surface with straight lines for meridians and parallels.

The mercatorial map was useful for navigation, despite its distortion of land masses near the poles.

Pertaining to merchants or commerce; mercantile (now rare).

The city's prosperity was due to its mercatorial activities along ancient trade routes.