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- Noun

An action induced by vital resistance to some other action; depression or exhaustion of vital force consequent on overexertion or overstimulation; heightened activity and overaction succeeding depression or shock.

- Noun

The force which a body subjected to the action of a force from another body exerts upon the latter body in the opposite direction.

- Noun

Any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action.

- Noun

Backward tendency or movement after revolution, reform, or great progress in any direction.

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