Associative

Formal Definition

A binary operation on a set $S$ is $associative$ if $(a*b)*c=a*(b*c)$ for all $a,b,c\in S$

Informal Definition

It can be shown that if $*$ is associative, then longer expressions such as $a*b*c*d$ are not ambiguous. Parentheses may be inserted in any fashion for purposes of computation; the final results of two such computations will be the same.

Example(s)

(1)
\begin{align} (2+4)+3=2+(4+3)\\ 6+3=2+7\\ 9=9 \end{align}