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What does vacuum mean?

Looking for the meaning or definition of the word vacuum? Here's what it means.

Noun
  1. A region of space that contains no matter.
  2. (plural only "vacuums") A vacuum cleaner.
  3. The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, such as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.
  4. (physics) A spacetime having tensors of zero magnitude
Verb
  1. (transitive) To clean (something) with a vacuum cleaner.
  2. (intransitive) To use a vacuum cleaner.
  3. (transitive, databases) To optimise a database or database table by physically removing deleted tuples.
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