a space that is completely empty of all gas, especially one from which all the air has been taken away
a vacuum cleaner
a situation in which someone or something is missing or lacking
create/leave a vacuum (in something)
Her husband's death left a vacuum in her life.
power/political/moral etc vacuum
the political vacuum caused by the ban on Communist Party activity
existing completely separately from other people or things and having no connection with them:
The process of learning a language does not take place in a vacuum.