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+ <h2 class="chapter">Abbrevs and Abbrev Expansion</h2>  <p>An abbreviation or <em>abbrev</em> is a string of characters that may be expanded to a longer string. The user can insert the abbrev string and find it replaced automatically with the expansion of the abbrev. This saves typing. </p> <p>The set of abbrevs currently in effect is recorded in an <em>abbrev table</em>. Each buffer has a local abbrev table, but normally all buffers in the same major mode share one abbrev table. There is also a global abbrev table. Normally both are used. </p> <p>An abbrev table is represented as an obarray. See <a href="creating-symbols">Creating Symbols</a>, for information about obarrays. Each abbreviation is represented by a symbol in the obarray. The symbol’s name is the abbreviation; its value is the expansion; its function definition is the hook function for performing the expansion (see <a href="defining-abbrevs">Defining Abbrevs</a>); and its property list cell contains various additional properties, including the use count and the number of times the abbreviation has been expanded (see <a href="abbrev-properties">Abbrev Properties</a>). </p>  <p>Certain abbrevs, called <em>system abbrevs</em>, are defined by a major mode instead of the user. A system abbrev is identified by its non-<code>nil</code> <code>:system</code> property (see <a href="abbrev-properties">Abbrev Properties</a>). When abbrevs are saved to an abbrev file, system abbrevs are omitted. See <a href="abbrev-files">Abbrev Files</a>. </p> <p>Because the symbols used for abbrevs are not interned in the usual obarray, they will never appear as the result of reading a Lisp expression; in fact, normally they are never used except by the code that handles abbrevs. Therefore, it is safe to use them in a nonstandard way. </p> <p>If the minor mode Abbrev mode is enabled, the buffer-local variable <code>abbrev-mode</code> is non-<code>nil</code>, and abbrevs are automatically expanded in the buffer. For the user-level commands for abbrevs, see <a href="https://www.gnu.org/software/emacs/manual/html_node/emacs/Abbrevs.html#Abbrevs">Abbrev Mode</a> in <cite>The GNU Emacs Manual</cite>. </p> <table class="menu" border="0" cellspacing="0"> <tr>
+<td align="left" valign="top">• <a href="abbrev-tables" accesskey="1">Tables</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Creating and working with abbrev tables. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="defining-abbrevs" accesskey="2">Defining Abbrevs</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Specifying abbreviations and their expansions. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="abbrev-files" accesskey="3">Files</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Saving abbrevs in files. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="abbrev-expansion" accesskey="4">Expansion</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Controlling expansion; expansion subroutines. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="standard-abbrev-tables" accesskey="5">Standard Abbrev Tables</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Abbrev tables used by various major modes. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="abbrev-properties" accesskey="6">Abbrev Properties</a>
+</td>
+<td> </td>
+<td align="left" valign="top">How to read and set abbrev properties. Which properties have which effect. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="abbrev-table-properties" accesskey="7">Abbrev Table Properties</a>
+</td>
+<td> </td>
+<td align="left" valign="top">How to read and set abbrev table properties. Which properties have which effect. </td>
+</tr> </table><div class="_attribution">
+  <p class="_attribution-p">
+    Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
+    <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Abbrevs.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Abbrevs.html</a>
+  </p>
+</div>