opponent - definition and synonyms

noun [countable] 

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  1. someone who is competing against you

    You’re facing a much more experienced opponent in tomorrow’s match.

    His opponent received only 36 per cent of the vote.

    1. a.
      someone who is arguing or fighting with you

      The president’s former adviser is now one of his most outspoken opponents.

    2. b.
      someone who disagrees with something such as an idea or plan and tries to change or stop it
      opponent of:

      opponents of the legislation