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Define the word ALGOL 60

ALGOL 60
     
         ALGOrithmic Language 1960.
     
        A portable language for scientific computations.  ALGOL 60 was
        small and elegant.  It was block-structured, nested,
        recursive and free form.  It was also the first language
        to be described in BNF.
     
        There were three lexical representations: hardware,
        reference, and publication.  The only structured data types
        were arrays, but they were permitted to have lower bounds
        and could be dynamic.  It also had conditional expressions;
        it introduced :=; if-then-else; very general "for" loops;
        switch declaration (an array of statement labels generalising
        Fortran's computed goto).  Parameters were call-by-name
        and call-by-value.  It had static local "own" variables.
        It lacked user-defined types, character manipulation and
        standard I/O.
     
        See also EULER, ALGOL 58, ALGOL 68, Foogol.
     
        ["Report on the Algorithmic Language ALGOL 60", Peter Naur
        ed., CACM 3(5):299-314, May 1960].
     
        (1995-01-25)