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Synonyms
ac·tiv·i·ty (ăk-tĭv́ĭ-tē)

noun: pl., -ties. 

  1. The state of being active.
  2. Energetic action or movement; liveliness.
    1. A specified pursuit in which a person partakes.
    2. An educational process or procedure intended to stimulate learning through actual experience.
  4. The intensity of a radioactive source.
  5. The ability to take part in a chemical reaction.
  6. A physiological process: respiratory activity.