[in-jek-shuh n] /ɪnˈdʒɛk ʃən/

the act of .
something that is .
a liquid into the body, especially for medicinal purposes, as a hypodermic or an enema.
state of being hyperemic or bloodshot.
Mathematics. a one-to-one function.
Also called insertion. Aerospace. the process of putting a spacecraft into orbit or some other desired trajectory.
fluid injected into the body, esp for medicinal purposes
something injected
the act of injecting

(maths) a function or mapping for which f(x) = f(y) only if x = y See also surjection, bijection

“forcing a fluid into a body” (with a syringe, etc.), early 15c., from Middle French iniection (14c.) or directly from Latin iniectionem (nominative iniectio), noun of action from past participle stem of inicere (see inject).

injection in·jec·tion (ĭn-jěk’shən)


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.


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  • Injector

    [in-jek-ter] /ɪnˈdʒɛk tər/ noun 1. a person or thing that injects. 2. Machinery. /ɪnˈdʒɛktə/ noun 1. a person or thing that injects 2. a device for spraying fuel into the combustion chamber of an internal-combustion engine 3. Also inspirator. a device for forcing water into a steam boiler

  • Injera

    /ɪnˈdʒɪərə/ noun 1. a white Ethiopian flatbread, similar to a crepe

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