Index: doc/LaTeXmacros/common.tex
===================================================================
--- doc/LaTeXmacros/common.tex	(revision 29f4713945bba7f56ad4b3a7302d0982f2c3cbbe)
+++ doc/LaTeXmacros/common.tex	(revision 759f05f48719425f2affcf339a1da8bdb2a91f2c)
@@ -11,6 +11,6 @@
 %% Created On       : Sat Apr  9 10:06:17 2016
 %% Last Modified By : Peter A. Buhr
-%% Last Modified On : Sat Feb 17 21:58:43 2018
-%% Update Count     : 369
+%% Last Modified On : Thu Mar 15 09:52:27 2018
+%% Update Count     : 378
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -101,5 +101,4 @@
 % index macros
 \newcommand{\italic}[1]{\emph{\hyperpage{#1}}}
-\newcommand{\definition}[1]{\textbf{\hyperpage{#1}}}
 \newcommand{\see}[1]{\emph{see}~#1}
 
@@ -148,4 +147,5 @@
 % Latin abbreviation
 \newcommand{\abbrevFont}{\textit}			% set empty for no italics
+\@ifundefined{eg}{
 \newcommand{\EG}{\abbrevFont{e}.\abbrevFont{g}.}
 \newcommand*{\eg}{%
@@ -153,5 +153,6 @@
 		{\@ifnextchar{:}{\EG}%
 			{\EG,\xspace}}%
-}%
+}}{}%
+\@ifundefined{ie}{
 \newcommand{\IE}{\abbrevFont{i}.\abbrevFont{e}.}
 \newcommand*{\ie}{%
@@ -159,20 +160,23 @@
 		{\@ifnextchar{:}{\IE}%
 			{\IE,\xspace}}%
-}%
+}}{}%
+\@ifundefined{etc}{
 \newcommand{\ETC}{\abbrevFont{etc}}
 \newcommand*{\etc}{%
 	\@ifnextchar{.}{\ETC}%
         {\ETC.\xspace}%
-}%
+}}{}%
+\@ifundefined{etal}{
 \newcommand{\ETAL}{\abbrevFont{et}~\abbrevFont{al}}
 \newcommand*{\etal}{%
 	\@ifnextchar{.}{\protect\ETAL}%
 		{\protect\ETAL.\xspace}%
-}%
+}}{}%
+\@ifundefined{viz}{
 \newcommand{\VIZ}{\abbrevFont{viz}}
 \newcommand*{\viz}{%
 	\@ifnextchar{.}{\VIZ}%
 		{\VIZ.\xspace}%
-}%
+}}{}%
 \makeatother