activity

(ak-tiv′ĭt-ē)

To hear audio pronunciation of this topic, purchase a subscription or log in.

[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.