Agreement or consent; the fact of two or more things happening at the same time; a combination of circumstances that work together.
From Old French concurrence, from Latin concurrentia (the act of running together). The meaning expanded from the physical sense of 'simultaneous occurrence' to include the sense of 'agreement' by the 16th century.
In law and government, 'concurrence' is crucial—justices write concurrences to agree with the outcome but for different reasons—showing how the word now describes not just happening together but actively agreeing together on a shared goal.
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