Coincidence is a phenomenon that occurs when two or more events happen at the same time in an unexpected way. It is often seen as a sign of FATE or destiny, and can be seen as either positive or negative. ACCIDENT is an event that happens unexpectedly and without intention, while FATE is a predetermined course of events that are believed to be out of one's control. CHANCE is a random occurrence that is not predetermined, and CONCURRENCE is the simultaneous occurrence of two or more events. FLUKE is an event that happens by CHANCE and is considered to be lucky or fortunate. All of these terms can be used to describe coincidence, which is the simultaneous occurrence of two or more events that are not necessarily related.