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fundamental

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adjective British English pronunciation: fundamental /ˌfʌndəˈment(ə)l/
  1. 1
    relating to the basic nature or character of something
    a fundamental flaw/weakness (=something basic that is wrong):

    Some people see this as a fundamental flaw in his argument.

    fundamental changes:

    We shall have to make some fundamental changes in the way we do business.

    fundamental difference:

    There was an even more fundamental difference in attitude between us.

    fundamental principle/issue/question:

    A fundamental principle of Anglo-American law is that crimes must be clearly defined.

  2. 2
    essential to the existence, development, or success of something
    fundamental to:

    My relationship with the actors is fundamental to my work as a director.

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