Etymology
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suction (n.)

1620s, "act or process of sucking," from Late Latin suctionem (nominative suctio), noun of action from past participle stem of Latin sugere "to suck" (see sup (v.2)). As "action produced by a vacuum" from 1650s.

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Definitions of suction
1
suction (v.)
remove or draw away by the force of suction;
the doctors had to suction the water from the patient's lungs
suction (v.)
empty or clean (a body cavity) by the force of suction;
suction the uterus in an abortion
2
suction (n.)
a force over an area produced by a pressure difference;
suction (n.)
the act of sucking;
Synonyms: sucking / suck
From wordnet.princeton.edu