Source : Webster's Revised Unabridged Dictionary (1913)

Suction \Suc"tion\, n. [L. sugere, suctum, to suck; cf. OF.
   suction. See {Suck}, v. t.]
   The act or process of sucking; the act of drawing, as fluids,
   by exhausting the air.

   {Suction chamber}, the chamber of a pump into which the
      suction pipe delivers.

   {Suction pipe}, {Suction valve}, the induction pipe, and
      induction valve, of a pump, respectively.

   {Suction pump}, the common pump, in which the water is raised
      into the barrel by atmospheric pressure. See Illust. of
      {Pump}.

Source : WordNet®

suction
     n 1: a force over an area produced by a pressure difference
     2: the act of sucking [syn: {sucking}, {suck}]

suction
     v 1: remove or draw away by the force of suction; "the doctors
          had to suction the water from the patient's lungs"
     2: empty or clean (a body cavity) by the force of suction;
        "suction the uterus in an abortion"