Absence of matter. A space empty of matter. A space relatively empty of matter. A space in which the pressure is significantly lower than atmospheric pressure.
A state of emptiness; a void.
A state of being sealed off from external or environmental influences; isolation.
pl. A vacuum cleaner.
Of, relating to, or used to create a vacuum.
Containing air or other gas at a reduced pressure.
Operating by means of suction or by maintaining a partial vacuum.