vac·uum 
(văkym, -yəm, -y-əm)
(văkym, -yəm, -y-əm)n. pl. vac·uums or vac·u·a (-y-ə)
1.
a. Absence of matter.
b. A space empty of matter.
c. A space relatively empty of matter.
d. A space in which the pressure is significantly lower than atmospheric pressure.
2. A state of emptiness; a void.
3. A state of being sealed off from external or environmental influences; isolation.
4. pl. vac·uums A vacuum cleaner.
adj.
1. Of, relating to, or used to create a vacuum.
2. Containing air or other gas at a reduced pressure.
3. Operating by means of suction or by maintaining a partial vacuum.
tr. & intr.v. vac·uumed, vac·uum·ing, vac·uums
To clean with or use a vacuum cleaner.
[Latin, empty space, from neuter of vacuus, empty, from vacāre, to be empty; see euə- in the Appendix of Indo-European roots.]