## prefix notation

<*language*>

(Or "prefix syntax") One of the possible orderings of functions and operands: in prefix notation the function precedes all its operands. For example, what may normally be written as "1+2" becomes "(+ 1 2)". A few languages (e.g., lisp) have strictly prefix syntax, many more employ prefix notation in combination with infix notation.

The opposite, postfix notation, is somewhat rarer.Last updated: 2014-07-08

### Nearby terms:

prefetch ♦ prefix ♦ **prefix notation** ♦ prefix syntax ♦ pre-order ♦ pre-order traversal

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