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maximum number of independent directions within a mathematical space From Wikiquote, the free quote compendium
A dimension is a conceptual means of designating and measuring many aspects of the complexity of Reality or any mathematical systems, observable within any world, Universe or Cosmos. In physics and mathematics, the dimension of a mathematical space, object, or event is informally defined as the minimum number of coordinates needed to specify any points within it. A line has a dimension of one because only one coordinate is needed to specify a point on it – for example, the point at 5 on a number line. A surface such as a plane or the surface of a cylinder or sphere has a dimension of two because two coordinates are needed to specify a point on it – for example, both a latitude and longitude is required to locate a point on the surface of a sphere. The inside of a cube, a cylinder or a sphere is three-dimensional (3D) because three coordinates are needed to locate a point within these spaces. The four common dimensions of spacetime consists of events that are not absolutely defined spatially and temporally, but rather are known relative to the motion of an observer. 10 or 11 dimensions are used in string theory, and the state-space of quantum mechanics is an infinite-dimensional function space. High-dimensional spaces frequently occur in mathematics and the sciences. They may be parameter spaces or configuration spaces such as in Lagrangian or Hamiltonian mechanics; these are abstract spaces, independent of the physical spaces and times of our Universe. In general usage, the word dimension can refer to any specifiable aspects or qualities of reality or perceptions.
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