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English definition of “suction”

suction

noun [U]     /ˈsʌk.ʃən/
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 pump Physical and chemical processes
(Definition of suction noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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