temporal region zero-dimensional temporal region A zero-dimensional temporal region is a temporal region that is without extent. (axiom label in BFO2 Reference: [102-001]) a temporal region that is occupied by a process boundary right now temporal instant. the moment at which a child is born the moment at which a finger is detached in an industrial accident the moment of death. (forall (x) (if (ZeroDimensionalTemporalRegion x) (TemporalRegion x))) // axiom label in BFO2 CLIF: [102-001]