S: (n) event (event%1:26:00::), case (case%1:26:00::) (a special set of circumstances) "in that event, the first possibility is excluded"; "it may rain in which case the picnic will be canceled"
S: (n) event (event%1:19:00::) (a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory)