plank - definition and synonyms

noun [countable] 

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  1. 2
    an important aspect of something, on which it is based
    the main/central plank of someone’s policy/argument/programme:

    Spending cuts remain the main plank of the party’s defence policy.

  2. 3
    something that is important to the success or failure of something

    She’s made fitness a central plank of her preparation for the tournament.