coincidence
Most people use this word to describe surprising events that happen at the same time by chance. In these cases, it is usually a countable noun (e.g., "a coincidence" or "many coincidences"). When used in mathematics or geometry to describe things occupying the same space, the word is more technical and less common in daily conversation. Avoid confusing this with 'incident'. A coincidence is about timing and chance, while an incident is a specific event or occurrence, often one that is unpleasant.
💬Casual Conversation
Just ran into your cousin at the cafe. Total coincidence.
No way. I'm literally cramming for finals and he's out wandering?
Meanings
A remarkable concurrence of events or circumstances without apparent causal connection.
"It was a complete coincidence that we both wore the same dress to the party."