organisation, organization, arrangement, system - an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"

cartesian coordinate system - a coordinate system for which the coordinates of a point are its distances from a set perpendicular lines that intersect at the origin of the system

coordinate axis - one of the fixed reference lines of a coordinate system

inertial frame, inertial reference frame - a coordinate system in which Newton's first law of motion is valid

space-time, space-time continuum - the 4-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are located

system of rules, system - a complex of methods or rules governing behavior; "they have to operate under a system they oppose"; "that language has a complex system for indicating gender"

vocabulary - the system of techniques or symbols serving as a means of expression (as in arts or crafts); "he introduced a wide vocabulary of techniques"