Any one of a set of numbers designating linear and/or angular quantities
that specify the position of a point on a line, in space, or on a given
plane or other surface in relation to a given reference system; e.g.,
latitude and longitude are coordinates of a point on the Earth's surface.
The term is usually used in the plural, esp. to designate the particular
kind of reference system (such as spherical coordinates, plane
coordinates, and polar coordinates). AGI
Dictionary of Mining, Mineral, and Related Terms