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act

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noun act pronunciation in American English /ækt/
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singularact
pluralacts
  1. 1
    [countable] a single thing that someone does
    act of violence/vandalism/terrorism/kindness/bravery/desperation etc.:

    No act of kindness is ever wasted.

    We strongly condemn any act of violence against innocent people.

    unlawful/criminal/wrongful/illegal etc. act:

    groups committing criminal acts

  2. 3
    [countable] one of the parts that a play, opera, or ballet is divided into. Each act is divided into two or more scenes

    The scene occurs at the beginning of the first act.

    Act 1, Scene 2

  3. 5
    [singular] a way of behaving that does not show what someone is really like or what they really feel

    She isn’t really upset: it’s all an act.

    put on an act:

    She’s just putting on an act because the boys are here.

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