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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 It might be outdated or ideologically biased.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 ?
Our former studies in insulin resistance rats induced by high-fat diet and T2DM rats induced by highfat diet plus low-dose STZ intraperitoneal injection found that there were obvious inflammation in such animals which were the same as that used in this study [20, 21].
In conclusion, intraperitoneal injection of OMT could beneficially decrease the CCI-induced mechanical allodynia and thermal hyperalgesia, antagonize the effect of NMDA, synergistic enhance the effect of MK801 and infenprodil, led to a marked decrease in NMDA NR2B, pERK and pCREB induced by CCI in the spinal cord in mice.
After 1 week ad libitum exposure to drinking water and standard rat pellet diet, diabetes was induced in overnight-fasted animals by an intraperitoneal injection (65 mg/kgBW) of streptozotocin (STZ) (Sigma-Aldrich, St.
All animals were made diabetic by intraperitoneal injection of streptozotocin (STZ) 40 mg/kg body weight, diluted in 0.05 mmol/L citrate buffer (pH 4.5), given daily for five consecutive days during first week of experiment.
Animals underwent anesthesia with 3.6% chloral hydrate by intraperitoneal injection and fixed on a stereotactic platform.
For intraperitoneal injection tests, animals received a single dose of agents via intraperitoneal injection without fasting.
In the swine model of food allergenicity, newborn piglets are sensitized to peanut protein by intraperitoneal injection of peanut extract plus the adjuvant cholera, followed by two subsequent booster injections 18 and 25 days later.
Diabetes was induced by giving single intraperitoneal injection of STZ in Group II to VI.
Rats were anesthetized with sodium pentobarbital (40 mg/kg) through intraperitoneal injection. The cardial I/R operation was carried out according to previous procedure (Zhu et al.
Groups of mice (n = 5) were exposed by intraperitoneal injection to 0.25 mL of phosphate-buffered saline containing 0.1% peanut lectin [a minor peanut allergen (Burks et al.
Lead intoxicated: Rats were given weekly intraperitoneal injection of lead acetate 10 mg /kg body weight for 6 weeks and were fed standard diet 8.
Group I (control) did not receive any treatment however to balance the stress level with group II, they were given an intraperitoneal injection of normal saline 10ml/kg body weight twice a week for the period of 4 weeks whereas group II (cisplatin) were administered an intraperitoneal injection of cisplatin 2mg/kg body weight twice a week for the period of 4 weeks.