from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force; as, an increasing variety of human activities.
  • n. something done as an action or a movement
  • n. something done for pleasure or entertainment, especially one involving movement or an excursion.
  • n. Use (of internet, playstation, bank account etc.)

from the GNU version of the Collaborative International Dictionary of English

  • n. The state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force.

from The Century Dictionary and Cyclopedia

  • n. The state of action; doing.
  • n. Activeness; the quality of acting promptly and energetically.
  • n. An exercise of energy or force; an active movement or operation; a mode or course of action.
  • n. In physical, a term introduced by Sir William Thomson as an equivalent of “rate of doing work,” or the rate per unit of time at which energy is given out by a working system.
  • n. A physical or gymnastic exercise; an agile performance.
  • n. In. psychology, a self-determination of mental process, experienced or inferred, especially characteristic of the conative consciousness.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a process existing in or produced by nature (rather than by the intent of human beings)
  • n. an organic process that takes place in the body
  • n. the state of being active
  • n. the trait of being active; moving or acting rapidly and energetically
  • n. (chemistry) the capacity of a substance to take part in a chemical reaction
  • n. any specific behavior


From Middle French activité, from Latin activitas. (Wiktionary)



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