texinfo: @dfn

Indicating

@abbr

@option

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9.1.12 '@dfn'{TERM}
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Use the '@dfn' command to identify the introductory or defining use of a
technical term.  Use the command only in passages whose purpose is to
introduce a term which will be used again or which the reader ought to
know.  Mere passing mention of a term for the first time does not
deserve '@dfn'.  The command generates italics in the printed manual,
and double quotation marks in the Info file.  For example:

     Getting rid of a file is called @dfn{deleting} it.

produces

     Getting rid of a file is called "deleting" it.

  As a general rule, a sentence containing the defining occurrence of a
term should be a definition of the term.  The sentence does not need to
say explicitly that it is a definition, but it should contain the
information of a definition--it should make the meaning clear.