meaning of prefix notation

1. prefix notation 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. Compare: postfix notation.
2. a parenthesis-free notation for forming mathematical expressions in which each operator precedes its operands

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