a space completely empty of substance or gas(es); a space in a container from which (almost all) the air has been pumped out; to use a vacuum cleaner to clean (a carpet etc)
emptiness
Cases of word usage
1) to preserve (food) by rapid freezing and drying it in a vacuum (freeze-dry)
2) the action of sucking; the process of removing air etc to produce a vacuum and to force in liquid or dust; a similar process producing a vacuum that causes two surfaces to stick together (suction)
3) vacuum flask (thermos)
4) a space completely empty of substance or gas(es); a space in a container from which (almost all) the air has been pumped out; to use a vacuum cleaner to clean (a carpet etc) (vacuum)
