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A '''singularity''' (sometimes '''spacetime singularity''') is, approximately, a place where quantities which are used to measure the [[gravitational]] field become [[infinity|infinite]]. Such quantities include the curvature of [[spacetime]] or the density of [[matter]]. More accurately, a [[spacetime]] with a singularity contains geodesics which cannot be completed in a smooth manner. The limit of such a geodesic is the singularity.

A '''singularity''' (sometimes '''spacetime singularity''') is, approximately, a place where quantities which are used to measure the [[gravitational]] field become [[infinity|infinite]]. Such quantities include the curvature of [[spacetime]] or the density of [[matter]]. More accurately, a [[spacetime]] with a singularity contains geodesics which cannot be completed in a smooth manner. The limit of such a geodesic is the singularity.