When things happen at the same time, it's a concurrence. If you pull up at a traffic light and you see your teacher in the car next to yours and your neighbor behind you, it's an unlikely concurrence.
The Latin root of concurrence is concurrentia, which means "a running together." You can use the noun concurrence to describe things that exist together or at the same time, and also when there's an agreement, especially of results or opinions, like a concurrence of opinions among the school board about spending money on a new playground, or a concurrence in your family about wanting pancakes for breakfast.
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