vacuum

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vacuum[1,noun] vacuum[2,adjective] vacuum aspiration vacuum aspirator vacuum tube

Main Entry: ¹vac·u·um
Pronunciation: vak-()yüm, -y-m, -ym
Function: noun
Inflected Form(s): plural vac·u·ums or vac·ua /-y-w/
1 : emptiness of space
2 a : a space absolutely devoid of matter b : a space partially exhausted (as to the highest degree possible) by artificial means (as an air pump) c : a degree of rarefaction below atmospheric pressure : NEGATIVE PRESSURE