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chief

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adjective [only before noun] American English pronunciation: chief /tʃif/
  1. 1
    main or most important

    The majority of the market has gone to their chief rival, Gateway.

    Unemployment was the chief cause of poverty during the 1930s.

    Dana had always considered her looks her chief asset.

  2. 2
    highest in authority, position, or rank

    Keith joined the company as chief industrial engineer.

    the government's chief negotiator at the talks

    Chief Justice William Rehnquist

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