Index

The small raised number that states the power of a base; in $5^3$, the index is $3$. The plural is indices.

A small raised number showing how many times a base is used as a factor; in $a^3$, the index is $3$.

A small raised number showing a power; for example, the index $2$ in $x^2$ means that $x$ is multiplied by itself.

A number written above and to the right of a base to show the power to which the base is raised.

The small raised number that tells you what power a base is raised to.

The raised number in a power, showing repeated multiplication or representing a reciprocal or root; in $a^n$, the index is $n$.

The small raised number in a power, also called an exponent. A positive integer index states how many factors of the base are multiplied; zero, negative and fractional indices have the meanings defined by the index rules.

The raised number that indicates a power; in $a^m$, the index is $m$. The plural is indices.