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@dfn{term}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.