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A function is known in biological systems as something done to a system through causation and evolution. In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output.
If we take as an example nitric oxide (NO) the molecule is known as a regulator and mediator of numerous processes in nervous, immune and cardiovascular systems. Because it has a wide variety of functions that extremely important in supporting life it was named the "Molecule of the Year" in 1992.
http://en.wikipedia.org/wiki/Biological_functions_of_nitric_oxide
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