Definition of "spacelike" []

• Having the properties of space (adjective)
• (of the interval between two events in spacetime) lying outside each other's light cone, so that no information can pass from one to the other (adjective)
• (of a four-vector) having a space component of greater magnitude than its time component multiplied by the speed of light (adjective)

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• "Penrose made the simple observation that the future conformal boundary of such a space-time can therefore be joined to the spacelike initial conformal boundary of a Friedmann-Robertson-Walker model to make a cyclic universe."
• "Now, in an open or flat Friedmann-Robertson-Walker cosmological model with no cosmological constant, whilst the past 'Big-Bang' singularity corresponds to a spacelike hypersurface in the boundary of the conformal compactification, the future timelike infinity corresponds to a single point."
• "The boundary of the conformal compactification contains components which correspond to singularities, and components which correspond to spacelike infinity, timelike infinity, (and null infinity)."