infix notation
    n 1: a notation for forming mathematical expressions using
         parentheses and governed by rules of operator precedence;
         operators are dispersed among the operands

infix notation \in"fix no*ta"tion\, n. (Computers)
   A notation for commands or instructions in which the operator
   is inserted between the terms on which it operates.
   Contrasted with prefix notation and postfix notation.

infix notation
infix syntax

    One of the possible orderings of functions and
   operands: in infix notation the functions are placed between
   their operands, such as "1+2".  Although infix notation is
   limited to binary functions most languages mix infix notation
   with prefix or postfix notation, as a form of syntactic
   sugar.

   (1997-01-17)