Definitions from Wiktionary (suction)

▸ noun:  (physics) A force which pushes matter from one space into another because the pressure inside the second space is lower than the pressure in the first.
▸ noun:  (physics) A force holding two objects together because the pressure in the space between the items is lower than the pressure outside that space.
▸ noun:  The process of creating an imbalance in pressure to draw matter from one place to another.
▸ noun:  (dentistry) A device for removing saliva from a patient's mouth during dental operations, a saliva ejector.
▸ noun:  (informal) influence; "pull".
▸ verb:  To create an imbalance in pressure between one space and another in order to draw matter between the spaces.
▸ verb:  To draw out the contents of a space.
▸ Also see suction

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