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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 transfusionblood transfusion,
transfer of blood from one person to another, or from one animal to another of the same species. Transfusions are performed to replace a substantial loss of blood and as supportive treatment in certain diseases and blood disorders.
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). 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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


(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 It might be outdated or ideologically biased.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 ?
Intramuscular injections into the buttocks: are they truly intramuscular?.
Although 70.8% of nurses know that the ventrogluteal site is safe, because it is far from big blood vessels and nerves, most of them still use the dorsogluteal site as their primary choice for the application of intramuscular injections. The dorsogluteal site is thought to be the site with the highest risk of complications when administering an intramuscular injection because it is rich in blood vessels; it is close to the sciatic nerve and the subcutaneous tissue layer is thicker.
The primary site of intramuscular injection was above all the buttock, and the necrosis appeared always in the same site of injection.
The question to be considered is if premature infants are at a greater risk of developing abscesses after an intramuscular injection. While the pharmacokinetics of drugs has been extensively tested in adults and children, there is very little data on the pharmacokinetics of drugs within infant populations [8].
She added that, while intramuscular injection of glucagon took several steps, giving the nasal powder was a "single-use, single-step" process that did not involve reconstitution before administration, which makes it simpler for others to give.
Nicolau syndrome (livedoid dermatitis, embolia cutis medicamentosa) is a rare complication of intramuscular injection that usually presents with pain at the injection site, hyperemia, skin discoloration, redness, abscess formation, and local ischemic necrosis involving the skin and adipose tissue.
Nicolau syndrome (also known as livedoid dermatitis) is a rare complication of intramuscular injection, which is manifested by pain, edema, and livedoid discoloration of the skin immediately after injection.
"Although the AD group as a whole had a normal response to Fluzone given in the skin, the large subset of AD patients who were colonized with Staphylococcus aureus had a reduced response to Fluzone vaccination when the vaccine was introduced into the skin as opposed to the conventional intramuscular injection," Dr.
Noting that reactogenicity and immunogenicity of vaccine therapy are impacted by successful intramuscular penetration, these authors recommend that the BMI be used as a factor in determining needle-length for deltoid intramuscular injection. The study concluded that to achieve a penetration of the deltoid muscle of 5 mm or more, a 25 mm- (1 inch-) long needle would achieve the desired results in both males and in females with BMI less than 35.
Their main drawbacks are that they are only suitable for intramuscular injection, appropriate sites can be difficult to hit, the volume of injection is limited and they are not easy for use on large numbers of animals.
DISCUSSION: 46 percent of hospitalized medical patients received at least one intramuscular injection during their stay.