activity

(ak-tiv′ĭt-ē )

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[Fr. activité, fr L. activitas ]

1. The production of energy or motion; the state of being active. In the medical sciences, activity applies to various conditions: from enzyme activity to the rate of influence of an enzyme on a particular system; radiation activity to the energy produced by a source of radiation.
2. A person's use of time.
3. Action, drug.

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