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root
- (math) A number used to build up another number by repeated multiplication. For example, since 2 × 2 × 2 = 8, two is said to be the third root or cube root of eight.
- (math) A solution of an equation. For example, 3 is a root of the equation x2 = 9. A root is also called a zero of a function because it is a value that will make the function zero (x = 3 will make the function f(x) = x2 - 9 zero.
The word comes from the Indo-European werad, which originally meant the roots of a plant but was later generalized to mean the origins, or beginnings of something whether it was physical or mental.
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