injection Meaning, Definition & Usage

  1. noun the forceful insertion of a substance under pressure
  2. noun any solution that is injected (as into the skin)
    injectant.
  3. noun the act of putting a liquid into the body by means of a syringe
    shot.
    • the nurse gave him a flu shot

WordNet

In*jec"tion noun
Etymology
L. injectio : cf.F. injection.
Definitions
  1. The act of injecting or throwing in; -- applied particularly to the forcible throwing in of a liquid, or aëriform body, by means of a syringe, pump, etc.
  2. That which is injected; especially, a liquid medicine thrown into a cavity of the body by a syringe or pipe; a clyster; an enema. Mayne.
  3. (Anat.) (a) The act or process of filling vessels, cavities, or tissues with a fluid or other substance. (b) A specimen prepared by injection.
  4. (Steam Eng.) (a) The act of throwing cold water into a condenser to produce a vacuum. (b) The cold water thrown into a condenser.

Webster 1913