spacetime

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An n-dimensional continuum consisting of dimensions of both space & time. Normally spacetime is considered as having 4 dimensions (x, y, z, t), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory
A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity

a Schwarzschild spacetime, a Reissner-Nordström spacetime, etc. as opposed to sense (2) describing the universe's spacetime as a whole: a Minkowski spacetime, a 5-dimensional spacetime, etc.

The four-dimensional continuum of the three spatial dimensions plus time

An event is a point in spacetime, specified by the coordinates x,y,z and t.

the four-dimensional Universe suggested by general relativity
the four-dimensional combination of space (three dimensions) and time (the fourth dimension) As a consequence of Special Relativity, time and space are not independent of each other and are relative to the motion of an observer
The four dimensional continuum of the three spatial dimensions plus time
1 Our local, solid, 3-D living environment (also referred to as the spacetime continuum) 2 The matter/energy building material of our local 3-D universe 3 A particle evaporation of n-space
A system of one time and three spatial coordinates, with respect to which the time and place of an event can be specified; also called spacetime continuum
A continuous, four-dimensional volume operating under a single set of physical laws, sometimes called a "dimension " Our "normal" spacetime consists of our observable physical universe: length, width, depth, and time Outside of normal spacetime, the normal laws of physics may not apply, and such oddities as alternate dimensions and alternate realities may be found
Minkowski spacetime
A geometrically flat spacetime, i.e. one with zero curvature. This is the type of spacetime that best approximates our universe
spacetime
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