The branch of mathematics dealing with spatial relationships.
A mathematical system that deals with spatial relationships and that is built on a particular set of axioms; a subbranch of geometry which deals with such a system or systems.
A mathematical object comprising representations of a space and of its spatial relationships.
The observed or specified spatial attributes of an object, etc.
The branch of mathematics that deals with the relationships between the sides and angles of (in particular) right-angled triangles, as represented by the trigonometric functions, and with calculations based on said relationships.