suc‧tion /ˈsʌkʃən/ noun [uncountable]
[Date: 1600-1700; Language: Late Latin; Origin: suctio, from Latin sugere 'to suck']

1. the process of removing air or liquid from an enclosed space so that another substance is sucked in, or so that two surfaces stick together:
My vacuum cleaner has very good suction.
a suction pump

2. the force that causes a substance to be sucked into a closed space when the air or liquid already present is removed

[TahlilGaran] Dictionary of Contemporary English ▲