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injection, introduction of a fluid into the body, usually by means of a needle and syringe. The material injected may be a test substance (as in determining allergic sensitivity or immunity to a disease), an anesthetic, a therapeutic drug, a nutrient (in cases where intravenous feeding is necessary), blood, or blood plasma (see blood transfusion). An intracutaneous injection is the introduction of a small amount of fluid between the skin layers. A subcutaneous injection is directed to the tissues under the skin. When quicker absorption of a drug is required, an intramuscular injection may be used; even more rapid action is obtained by injection into a vein (intravenous). In certain emergencies involving the heart, such as cardiac arrest, an intracardiac injection can penetrate directly into a chamber of the musculature of the heart. Anesthetics are sometimes injected into the spine. In an injection by means of a jet injector gun, fluid penetrates through the skin by means of air pressure and there is no visible puncture mark. Micro-injections can be made into fetuses, even individual cells, with tiny capillary injectors.
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(insertion) The process of boosting a spacecraft into a particular orbit or trajectory. It is also the time of such action or the entry itself.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the introduction of small quantities of medicine in solution or emulsion into subcutaneous tissue, intramuscularly, or intravenously with syringe and needle. With injection a more rapid effect is achieved than with ingestion, as well as precise dosage and reliability of effect. With injection, medication may be introduced regardless of the condition of the patient, such as unconsciousness and inability to swallow. For localized effect medicinal solutions are injected into the pleural cavity or joints; intradermal injections are used for analgesia and for diagnostic purposes, for example, the Mantoux reaction for diagnosing tuberculosis. Intracardiac injection is resorted to when there is a sudden heart stoppage (injury from electric shock, gas poisoning, and narcosis). Injection into the cerebrospinal canal is done for analgesia and treatment of certain diseases. The rules of asepsis must be observed without fail in injection.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

What does it mean when you dream about an injection?

In traditional psychoanalysis, a dream about an injection is often viewed as a dream about sexual intercourse. Can also indicate an influence that is forced on us. If we had bad experiences with being inoculated as children, then an injection dream can represent any number of different anxieties and fears.

The Dream Encyclopedia, Second Edition © 2009 Visible Ink Press®. All rights reserved.


(aerospace engineering)
The process of placing a spacecraft into a specific trajectory, such as an earth orbit or an encounter trajectory to Mars. Also known as insertion.
The method of applying a signal to an electronic circuit or device.
The process of introducing electrons or holes into a semiconductor so that their total number exceeds the number present at thermal equilibrium.
Also known as intrusion; sedimentary injection.
A process by which sedimentary material is forced under abnormal pressure into a preexisting rock or deposit.
A structure formed by an injection process.
A mapping ƒ from a set A into a set B which has the property that for any element b of B there is at most one element a of A for which ƒ(a) = b. Also known as injective mapping; one-to-one mapping; univalent function.
(mechanical engineering)
The introduction of fuel, fuel and air, fuel and oxidizer, water, or other substance into an engine induction system or combustion chamber.
Introduction of a fluid into the skin, vessels, muscle, subcutaneous tissue, or any cavity of the body.
The substance injected.
(mining engineering)
The introduction under pressure of a liquid or plastic material into cracks, cavities, or pores in a rock formation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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.


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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
El-Maghraby, "Efficacy of Intradermal Injection of Tranexamic Acid, Topical Silymarin and Glycolic Acid Peeling in Treatment of Melasma: A Comparative Study," Journal of Clinical & Experimental Dermatology Research, vol.
Frizelle, "Intradermal injection of methylene blue for the treatment of refractory pruritus ani," Colorectal Disease, vol.
Intradermal injection of pollens causes to itch firstly and after half hour leads to inflammation and reddening in the point of injection.
This likely reflects the slower systemic uptake of an intraparenchymal or intradermal injection.
One possible solution is Becton, Dickinson & Co.'s device for intradermal injection of insulin lispro, which capitalizes on the fact that insulin is consistently absorbed more rapidly intradermally than subcutaneously.
Intradermal injection of Dp significantly enhanced ear thickening compared with saline injection from 4 days after the first injection of Dp (Figure 1A; p < 0.05).
Increase in collagen turnover induced by intradermal injection of carbon dioxide in rats.
The stability and quality control of vaccines strain, production processes, and intradermal injection techniques are being reappraised.
For example, when withdrawing the needle after insertion of an intradermal injection do not massage the site with a swab as this may cause the fluid to escape (Crisp & Taylor, 2005).
The use of subcutaneous injection of isotonic saline, rather than intradermal injection, has been trialled in overseas studies, where it has been reported to cause less discomfort at the time of injection (Bahasadri et al 2006; Martensson and Wallin 1999) and while it has been effective in some situations, the duration of efficacy is reported to be markedly lessened.
(lidocaine HCI monohydrate powder intradermal injection system, Anesiva Inc.)
Here's something to think about while giving your itchy dog a bath: "Intradermal injection of heat-killed Mycobacterium vaccae in dogs with atopic dermatitis," a report in the journal Veterinary Dermatology (Vol.