injection (noun)

the forceful insertion of a substance under pressure

injection, injectant (noun)

any solution that is injected (as into the skin)

injection, shot (noun)

the act of putting a liquid into the body by means of a syringe

"the nurse gave him a flu shot"

injection (Noun)

The act of injecting, or something that is injected.

injection (Noun)

Something injected subcutaneously, intravenously, or intramuscularly by use of a syringe and a needle.

injection (Noun)

A function that maps distinct x in the domain to distinct y in the codomain; formally, a f:XY such that f(a) = f(b) implies a = b for any a, b in the domain.

injection (Noun)

A relation on sets (X,Y) that associates each element of Y with at most one element of X.

injection (Noun)

The addition of money to someone, or to a business.

Injection

An injection is an infusion method of putting fluid into the body, usually with a syringe and a hollow needle which is pierced through the skin to a sufficient depth for the material to be administered into the body. An injection follows a parenteral route of administration; that is, administration via a route other than through the digestive tract. There are several methods of injection or infusion, including intradermal, subcutaneous, intramuscular, intravenous, intraosseous, and intraperitoneal. Long-acting forms of subcutaneous/intramuscular injections are available for various drugs, and are called depot injections. Injections are among the most common health care procedures, with at least 16 billion administered in developing and transitional countries each year. 95% of injections are administered in curative care, 3% are for immunization, and the rest for other purposes, such as blood transfusions.