(m4.info)Definitions

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5 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, and bring back the original value at a later time.

Define

Defining a new macro

Arguments

Arguments to macros

Pseudo Arguments

Special arguments to macros

Undefine

Deleting a macro

Defn

Renaming macros

Pushdef

Temporarily redefining macros

Indir

Indirect call of macros

Builtin

Indirect call of builtins