(m4.info) Define

 
 Defining a macro
 ================
 
    The normal way to define or redefine macros is to use the builtin
 `define':
 
      define(NAME [, EXPANSION])
 
 which defines NAME to expand to EXPANSION.  If EXPANSION is not given,
 it is taken to be empty.
 
    The expansion of `define' is void.
 
    The following example defines the macro FOO to expand to the text
 `Hello World.'.
 
      define(`foo', `Hello world.')
      =>
      foo
      =>Hello world.
 
    The empty line in the output is there because the newline is not a
 part of the macro definition, and it is consequently copied to the
 output.  This can be avoided by use of the macro `dnl'.   Dnl,
 for details.
 
    The macro `define' is recognized only with parameters.

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