Meaning of VACUUM in English
( n. )
A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012