\begin{definition}[Definition:Array/Element/Index]
Let $\mathbf A$ be an $m \times n$ array.
Let $a_{i j}$ be an element of $\mathbf A$.
Then the subscripts $i$ and $j$ are referred to as the '''indices''' (singular: '''index''') of $a_{i j}$.
Category:Definitions/Arrays
\end{definition}