/ ˈsʌkʃn; NAmE / noun
[ U ] the process of removing air or liquid from a space or container so that sth else can be sucked into it or so that two surfaces can stick together :
Vacuum cleaners work by suction.
a suction pump / pad
► suc·tion verb [ vn ] ( technical )
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WORD ORIGIN
early 17th cent.: from late Latin suctio(n-) . from Latin sugere suck.