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[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.
1535-45; < Latin 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. 2015.
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Examples from the web for injection
  • Squeezing a monkey in a cage in order to give her an injection, or darting and anesthetizing a chimpanzee causes terror.
  • One of the reasons this system works is the ability to effectively mix the three components prior to injection into the mine.
  • The rats' rectal temperatures lowered after the injection, and the effect lasted for an hour and a half.
  • Blood tests measure the amount of specific antibodies circulating in the blood after an injection of the suspect substance.
  • But the film's careful injection of a warm, humanist spirit into an elaborate magical realist vision sets it apart.
  • What he did understand was the basic injection system-how the virus propagated itself-which alone demanded an alert.
  • Thus, the potato vaccine had probably created memory cells that the injection activated.
  • For a full year after injection, the researchers will monitor the patients' cognition and vision.
  • Their sniffers ran on overdrive for several hours following the injection.
  • About six hours after injection, the cells start producing proteins that combat the damaging inflammation.
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
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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
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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.
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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.
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injection in Technology

1. A function, f : A -> B, is injective or one-one, or is an injection, if and only if
for all a,b in A, f(a) = f(b) => a = b.
I.e. no two different inputs give the same output (contrast many-to-one). This is sometimes called an embedding. Only injective functions have left inverses f' where f'(f(x)) = x, since if f were not an injection, there would be elements of B for which the value of f' was not unique. If an injective function is also a surjection then is it a bijection.
2. An injection function is one which takes objects of type T and returns objects of type C(T) where C is some type constructor. An example is
f x = (x, 0).
The opposite of an injection function is a projection function which extracts a component of a constructed object, e.g.
fst (x,y) = x.
We say that f injects its argument into the data type and fst projects it out.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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