• The effort of performing or doing something.
  • Something done, often so as to accomplish a purpose.
  • A way of motion or functioning.
  • Fast-paced activity.
  • A mechanism; a moving part or assembly.
  • The mechanism, that is the set of moving mechanical parts, of a keyboard instrument, like a piano, which transfers the motion of the key to the sound-making device.
  • The distance separating the strings and the fretboard on a guitar.
  • Sexual intercourse.
  • Combat.
  • A charge or other process in a law court (also called lawsuit and actio).
  • A mapping from a pairing of mathematical objects to one of them, respecting their individual structures. The pairing is typically a Cartesian product or a tensor product. The object that is not part of the output is said to act on the other object. In any given context, action is used as an abbreviation for a more fully named notion, like group action or left group action.
  • The product of energy and time, especially the product of the Lagrangian and time.
  • The event or connected series of events, either real or imaginary, forming the subject of a play, poem, or other composition; the unfolding of the drama of events.
  • The attitude or position of the several parts of the body as expressive of the sentiment or passion depicted.
  • spin put on the bowling ball.
  • A share in the capital stock of a joint-stock company, or in the public funds.



  • To act on a request etc, in order to put it into effect.
  • To initiate a legal action against someone.


Narrower meaning words


  • From Middle English accion, from Old French aucion,acciun, from Latin āctiō ("act of doing or making"), from āctus + action suffix -iō, perfect passive participle of agō, ultimately from Proto-Indo-European *h₂éǵeti; see also act, active.
  • Morphologically act + -ion.

Modern English dictionary

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