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suction

noun [U]
 
 
/ˈsʌk.ʃən/

Definition

the act of removing air from a space resulting in a lower pressure in that space, either causing liquid, gases, or other substances to enter, or causing two surfaces to stick together: a suction pumpPhysical and chemical processes
(Definition of suction noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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