A remarkable concurrence of events or circumstances without apparent causal connection.
It was a coincidence that we were on the same train.
Running into my childhood friend at the airport was a delightful coincidence, as we hadn't seen each other in years.
The timing of their promotions was purely a coincidence, as both colleagues excelled in their roles independently.
It was a strange coincidence that the song they were discussing played on the radio just as they mentioned it.
The fact that they chose the same day for their wedding turned out to be a happy coincidence, bringing extended family together for a double celebration.
