| noun | an event that might have been arranged although it was really accidental |
| noun | the quality of occupying the same position or area in space “he waited for the coincidence of the target and the cross hairs” |
| noun | the temporal property of two things happening at the same time “the interval determining the coincidence gate is adjustable” |
| coincident | adjective | matching point for point |
| concurrent | adjective | occurring or operating at the same time |
| concur | verb | happen simultaneously |
| coincide | verb | happen simultaneously |
| co-occurrent | adjective | occurring or operating at the same time |