coincidence

noun

• 1a remarkable concurrence of events or circumstances without apparent causal connection:it’s no coincidence that this new burst of innovation has occurred in the free nations they met by coincidence

• 2correspondence in nature or in time of occurrence:the coincidence of interest between the mining companies and certain politicians

• 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.