An injection is an infusion method of putting liquid into the body, usually with with a hollow needle and a syringe which is pierced through the skin to a sufficient depth for the ...
http://en.wikipedia.org/wiki/Injection_%28medicine%29

Injection may refer to: Injection (medicine), a method of putting liquid into the body with a syringe and a hollow needle that punctures the skin. Injective function in mathematics ...
http://en.wikipedia.org/wiki/Injection

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Let f be a function defined on a set A and taking values in a set B. Then f is said to be an injection (or injective map, or embedding) if, whenever f(x)=f(y), it must be the case ...
http://mathworld.wolfram.com/Injection.html