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(m4.info)Definitions

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How to define new macros
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   Macros can be defined, redefined and deleted in several different
ways.  Also, it is possible to redefine a macro, without losing a
previous value, which can be brought back at a later time.

Define

Defining a new macro

Arguments

Arguments to macros

Pseudo Arguments

Pseudo arguments to macros

Undefine

Deleting a macro

Defn

Renaming macros

Pushdef

Temporarily redefining macros

Indir

Indirect call of macros

Builtin

Indirect call of builtins