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function science definition
- A relationship between two sets that matches each member of the first set with a unique member of the second set. Functions are often expressed as an equation, such as y = x + 5, meaning that y is a function of x such that for any value of x, the value of y will be 5 greater than x.
- A quantity whose value depends on the value given to one or more related quantities. For example, the area of a square is a function of the length of its sides.
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