A rare or obsolete term meaning a concurrence, convergence, or running together; the act of coming together.
From Latin concursio, from concurrere (con- + currere 'to run'). A Latinate nominalization that appears in some older English texts but was largely superseded by the more common 'concurrence.'
Concursion is a dead word that died quietly, replaced by its more popular cousin concurrence—it shows how English sometimes creates multiple words from the same root but then favors one, leaving others as ghostly alternatives in old books.
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