: a thing done : deed. an emergency requiring action. the action of water on rocks. An actor's words and actions should agree. Most of the play's action takes place in a courtroom. As the action unfolds, we …

A soldier or other member of the armed forces who is missing in action cannot be found after a battle or other military action, so it is not possible to say if they are dead or alive.

An action is a thing that is done, and not merely thought or spoken about. Possible actions could range from blinking to invading a country.

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Definition of action noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

21 meanings: 1. the state or process of doing something or being active; operation 2. something done, such as an act or deed 3..... Click for more definitions.

ACTION definition: the process or state of acting or of being active. See examples of action used in a sentence.