coincidence

(n) an event that might have been arranged although it was really accidental happenstance,
(n) the quality of occupying the same position or area in space
- he waited for the coincidence of the target and the cross hairs
(n) the temporal property of two things happening at the same time
- the interval determining the coincidence gate is adjustable
conjunction, co-occurrence, concurrence,

happenstance conjunction co-occurrence concurrence

coincident