The quality or state of moving together in the same direction or manner; mutual progression.
From 'cogredient,' which comes from Latin 'co-' (together) and 'gradiens' (walking, stepping), combined with the English suffix '-cy.'
This mathematical and geometric term describes when two things move or change in lockstep with each other—it's the noun form of 'cogredient' and appears mainly in technical academic texts.
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