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chief

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

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

    Dana had always considered her looks her chief asset.

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

  2. 2
    highest in authority, position, or rank

    Keith joined the company as chief industrial engineer.

    the government's Chief Medical Officer

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