Definition of vacua:
(n) :
A region of space that contains no matter.
(n) :
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.
(v) :
(transitive) To clean (something) with a vacuum cleaner.
(v) :
(intransitive) To use a vacuum cleaner.
(n) :
An emptiness in life created by a loss of a person who was close, or of an occupation.
(n) :
An exercise in which one draws their abdomen towards the spine.