suction

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suction

1. the force or condition produced by a pressure difference, as the force holding a suction cap onto a surface
2. the act or process of producing such a force or condition

suction

1. In plastering, the absorption of water from a plaster finish coat by the base coat (or the base, such as block or gypsum lath), thus providing a better bond and causing it to adhere to the base coat.
2. The adhesion of mortar to bricks.