activity

The definition of activity is something that you do or something that is going on.

(noun)

  1. Going to the movies is an example of an activity.
  2. A parade is an example of activity
  3. A room where a lot of people are moving about is an example of a room alive with activity.

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See activity in Webster's New World College Dictionary

noun pl. activities

  1. the quality or state of being active; action
  2. energetic action; liveliness; alertness
  3. a normal function of the body or mind
  4. an active force
  5. any specific action or pursuit: recreational activities
  6. Chem.
    1. the ability to react with other chemicals
    2. a thermodynamic quantity which represents the effective concentration of a substance in a reacting chemical system
    3. optical activity

See activity in American Heritage Dictionary 4

noun pl. ac·tiv·i·ties
  1. The state of being active.
  2. Energetic action or movement; liveliness.
  3. a. A specified pursuit in which a person partakes.
    b. 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.

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