co-occurrence
1. [ noun ] an event or situation that happens at the same time as or in connection with another
Synonyms: accompaniment concomitant
Related terms: happening background associate coincide
2. [ noun ] the temporal property of two things happening at the same time
Synonyms: conjunction coincidence concurrence
Examples:

"the interval determining the coincidence gate is adjustable"

Related terms: simultaneity contemporaneity concomitance unison overlap concur
Similar spelling:   cooccurring