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role

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noun [countable] role pronunciation in American English /roʊl/ 
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singularrole
pluralroles
  1. 1
    the purpose or influence of someone or something in a particular situation

    It's not my role to tell the politicians what to do.

    role in:

    We expect parents to have a key role in this discussion.

    play a role:

    Labor unions have played a significant role in the recent debate.

    role of:

    The book examines the role of food and drink in society.

    role as:

    The banks developed a new role as providers of financial services.

  2. 2
    the character played by a particular actor in a movie, play, etc.

    He won an Oscar for his role.

    take/play the role of someone:

    Who took the role of Ursula?

    leading/starring role (=the most important role):

    The leading role should have gone to a more well-known star.

pre-roll

a video advertisement that appears immediately before an online video

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