injection

injection (ɪnˈdʒɛkʃən)

—n
1.	fluid injected into the body, esp for medicinal purposes
2.	something injected
3.	the act of injecting
4.	a. the act or process of introducing fluid under pressure, such as fuel into the combustion chamber of an engine
	b. (as modifier): injection moulding
5.	maths surjection See also bijection a function or mapping for which f(x) = f(y) only if x = y

in'jective

—*adj*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

injection in·jec·tion (ĭn-jěk'shən)
n.

The act of injecting a substance into a tissue, vessel, canal, or organ.
Something that is injected, especially a dose of liquid medicine injected into the body.
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

American Heritage

Science Dictionary

injection

(ĭn-jěk'shən) Pronunciation Key

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

FOLDOC

Computing Dictionary

injection definition

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.
(1995-03-14)

Example sentences

About six hours after injection, the cells start producing proteins that combat

the damaging inflammation.

Amazingly, the bogus injection relieved the soldier's agony and prevented the

onset of shock.

One of the reasons this system works is the ability to effectively mix the

three components prior to injection into the mine.

The influenza vaccines can be given by injection or nasally.

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Matching Quote

"The warning given to Louis XVI: "No, sire, this is not a rebellion, it is a revolution," accents the essential difference. It means precisely that "it is the absolute certainty of a new form of government." Rebellion is, by nature, limited in scope. It is no more than an incoherent pronouncement. Revolution, on the contrary, originates in the realm of ideas. Specifically, it is the injection of ideas into historical experience, while rebellion is only the movement that leads from individual experience into the realm of ideas. While even the collective history of a movement of rebellion is always that of a fruitless struggle with facts, of an obscure protest which involves neither methods nor reasons, a revolution is an attempt to shape action to ideas, to fit the world into a theoretic frame. That is why rebellion kills men while revolution destroys both men and principles."

-Albert Camus

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