Definition of vacuum noun from the Oxford Advanced American Dictionary



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  1. 1a space that is completely empty of all substances, including all air or other gas a vacuum pump (= one that creates a vacuum ) vacuum-packed foods (= in a package from which most of the air has been removed)
  2. 2 a vacuum cleaner
  3. 3[usually singular] a situation in which someone or something is missing or lacking His resignation has created a vacuum which cannot easily be filled.
  4. Idioms
    in a vacuum
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    existing separately from other people, events, etc. when there should be a connection This kind of decision cannot ever be made in a vacuum.
See the Oxford Advanced Learner's Dictionary entry: vacuum