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vacuum

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noun British English pronunciation: vacuum /ˈvækjʊəm/ 
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singularvacuum
pluralvacuums
  1. 2
    [singular] a feeling that something is missing, or a situation in which something is missing
    political/power vacuum:

    the political vacuum left by his unexpected death

    create a vacuum:

    The collapse of the dictatorship created a vacuum in which criminal gangs flourished.

    fill a vacuum (=replace something):

    They need something to fill the vacuum left by the end of Marxism.

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