What is the meaning of Vacuum?

A region of space that contains no matter.

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.

Ellipsis of vacuum cleaner.

A spacetime having tensors of zero magnitude.

An emptiness in life created by a loss of a person who was close, or of an occupation.

An exercise in which one draws their abdomen towards the spine.

To clean (something) with a vacuum cleaner.

To use a vacuum cleaner.

To optimise a database or database table by physically removing deleted tuples.

vacuum (space containing no matter)

accusative neuter singular of vacuus

vacuum

vacuum

Source: wiktionary.org