The Definition Commands
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Texinfo provides more than a dozen definition commands, all of which
are described in this section.
The definition commands automatically enter the name of the entity in
the appropriate index: for example, `@deffn', `@defun', and `@defmac'
enter function names in the index of functions; `@defvr' and `@defvar'
enter variable names in the index of variables.
Although the examples that follow mostly illustrate Lisp, the commands
can be used for other programming languages.