The quality or state of being a counterpotence; the ability to oppose or counteract a force with equal strength.
From counter- + potency (from Latin potentia). The -cy suffix creates an abstract noun form describing the condition or quality of having counterpotence.
The distinction between counterpotence and counterpotency is subtle but important: one is the force itself, the other is the capacity to create that force. It's like the difference between 'power' and 'capability'—counterpotency is what you have, counterpotence is what you do.
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