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. There's more to see -- the rest of this topic is available only to subscribers.
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