n.

1. 巧合；巧事；同时发生[U][C]
   It was a coincidence that he was born on his mother's birthday.

   他在他母亲生日那天出生，真是巧事。

2. 符合，一致[U]
   Is there any coincidence between his opinions and your own?

   他的意见与你自己的意见有没有一致之处？

n.

1. a remarkable concurrence of events or circumstances without apparent causal connection.
2. correspondence in nature or in time of occurrence.
3. Physics  the presence of ionizing particles or other objects in two or more detectors simultaneously, or of two or more signals simultaneously in a circuit.