The act of concerting; a state of agreement or coordination achieved through mutual planning or arrangement.
From Latin 'concertio,' derived from 'concertare' (to bring into agreement), with the abstract noun suffix '-ion' added. The term preserves a more formal, somewhat archaic sense of coordination.
While 'concertion' is now quite rare in modern English, it once described any kind of coordinated effort—it's been replaced by 'coordination' and 'collaboration,' but its root reminds us that orchestration and agreement both come from music.
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