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A value that is already "built in" to a function.

Example: if a function that works out the height of a tree is h(year) = 20 × year, then "year" is a variable and "20" is a parameter.

Parameters can be changed so that the function can be used for other things.

Example: A different tree might have a growth rate of 30 cm per year, and its function would be h(year) = 30 × year

We could even make it more general by writing

h(age; rate) = rate × age

and in this case a semicolon (;) is used to separate the variable(s) from the parameters(s)

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