# Definition

## statement of the meaning of a word or phrase / From Wikipedia, the free encyclopedia

A **definition** in language explains what a word or phrase means. A definition usually answers the question *what is...*. *Defining* means giving a definition.

Other words with this meaning are *description* and *explanation*. It describes what a word means and explains to the person when and where it can be used.

In mathematics, a definition is an exact way of saying what a mathematical concept is. It might not be the easiest way to say what it is, but it is used because it is exact. It can be used in a mathematical proof.

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