n, pl  vac*u*ums  or  vac*ua   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
adj 1  :  of, containing, producing, or utilizing a partial vacuum <separated by means of distillation>   2  :  of or relating to a vacuum device or system .
 
    
 
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