What is the root in English?

In mathematics, a root of a number or polynomial equation is a number that satisfies the equation. For example, 3 is a root of the equation x2 - 9 = 0. The term root can also refer to the operation of finding the roots of an equation.

In linguistics, a root is the basic form of a word to which prefixes and suffixes can be added. For example, the root of the word "beautiful" is "beau".

In botany, a root is the part of a plant that anchors it in the ground and absorbs water and nutrients.

In computer science, a root can refer to the top level of a tree data structure or to the directory from which all other directories on a file system are descended.