1 the act or process of sucking
2 the force or condition produced by a pressure difference, as the force holding a suction cap onto a surface
3 the act or process of producing such a force or condition (C17: from Late Latin suctio a sucking, from Latin sugere to suck)
n a pump for raising water or a similar fluid by suction. It usually consists of a cylinder containing a piston fitted with a flap valve
n (Phonetics) another word for →
n a nonreturn valve in a pump suction to prevent the pump draining or depriming when not in service, (Also called)
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"