n. The act or process of sucking.n. A force that causes a fluid or solid to be drawn into an interior space or to adhere to a surface because of the difference between the external and internal pressures.v. To draw away or remove by the force of suction: suction fluid from the lungs. v. To clean or evacuate (a body cavity, for example) by the force of suction.adj. Creating suction.adj. Operating or operated by suction.