(geometry) A non-Euclidean geometry in which the distance between two points is the sum of the absolute differences between their corresponding coordinates.

(geometry) Any system of geometry not based on the set of axioms of Euclidean geometry, which is based on the three-dimensional space of common experience.

(geometry) The familiar geometry of the real world, based on the postulate that through any two points there is exactly one straight line.

The study of landforms, their classification, origin, development, and history.

The magnetism of the Earth. / The science that studies the magnetism of the Earth.

(geometry, uncountable) The branch of geometry dealing with what can be deduced in Euclidean geometry when the notions of line length and angle size are ignored.

(geometry) A US spelling of non-Euclidean geometry.

(mathematics) A branch of mathematics that studies algebraic varieties (solution sets of polynomial equations) and their generalisations, using techniques from both algebra (chiefly commutative algebra) and geometry.

(geometry, uncountable) The geometry of the 2-dimensional surface of a sphere;

(mathematics) a branch of mathematics that investigates those properties of figures that are invariant when projected from a point to a line or plane