Learner's definition of SUCTION
[noncount]
: the act or process of removing the air, water, etc., from a space in order to pull something into that space or in order to cause something to stick to a surface吸;抽吸;吸引 also : the force with which the air, water, etc., in a space is removed吸力 2 suction /ˈsʌkʃən/ verb
suctions; suctioned; suctioning
suctions; suctioned; suctioning
Learner's definition of SUCTION
[+ object] technical
: to remove (something) by pulling it with the force of moving water, air, etc. : to remove (something) by using suction(用流水、空气等)清除,吸除