relaxation is a topic covered in the Taber's Medical Dictionary.

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(rē-lăk-sā′shŭn )

1. A lessening of tension or activity in a part.
2. A phase or period in a single muscle twitch following contraction in which tension decreases, fibers lengthen, and the muscle returns to a resting position.
3. In magnetic resonance imaging, the return of an excited atom to alignment with the applied magnetic field.

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