Try Our Apps


Avoid these words. Seriously.


[in-jek-shuh n] /ɪnˈdʒɛk ʃən/
the act of injecting.
something that is injected.
a liquid injected into the body, especially for medicinal purposes, as a hypodermic or an enema.
state of being hyperemic or bloodshot.
Mathematics. a one-to-one function.
Also called insertion. Aerospace. the process of putting a spacecraft into orbit or some other desired trajectory.
Origin of injection
First recorded in 1535-45, injection is from the Latin word injectiōn- (stem of injectiō). See inject, -ion
Related forms
postinjection, adjective
reinjection, noun
superinjection, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for injection
Contemporary Examples
Historical Examples
  • Quickly she removed her father's coat and made the injection.

    The End of Time Wallace West
  • It is simply incapable of movement, as would happen after an injection of curare.

    The Industries of Animals Frdric Houssay
  • Dimly, I was aware of the injection, and immediately felt better.

    Question of Comfort Les Collins
  • And the process will be by the injection of a new and mighty motive power.

    Quiet Talks on Power S.D. Gordon
  • Casuistry is nothing but the injection of your own meaning into an old name.

    A Preface to Politics

    Walter Lippmann
British Dictionary definitions for injection


fluid injected into the body, esp for medicinal purposes
something injected
the act of injecting
  1. the act or process of introducing fluid under pressure, such as fuel into the combustion chamber of an engine
  2. (as modifier): injection moulding
(maths) a function or mapping for which f(x) = f(y) only if x = y See also surjection, bijection
Derived Forms
injective, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for injection

"forcing a fluid into a body" (with a syringe, etc.), early 15c., from Middle French iniection (14c.) or directly from Latin iniectionem (nominative iniectio), noun of action from past participle stem of inicere (see inject).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
injection in Medicine

injection in·jec·tion (ĭn-jěk'shən)

  1. The act of injecting a substance into a tissue, vessel, canal, or organ.

  2. Something that is injected, especially a dose of liquid medicine injected into the body.

  3. Congestion or hyperemia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
injection in Science
  1. A substance that is introduced into a organism, especially by means of a hypodermic syringe, as a liquid into the veins or muscles of the body.

  2. A function that maps each member of one set (the domain) to exactly one member of another set (the range). Compare bijection, surjection.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for injection

Difficulty index for injection

Most English speakers likely know this word

Word Value for injection

Scrabble Words With Friends