\documentclass{scrreprt}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage[nonumberlist,acronym]{glossaries}
\usepackage{multicol}
\makeglossary
\newglossaryentry{Abk}{name={Abk}, description={Abkürzung}}
\begin{document}
Das ist ein Text mit Abk.\gls{Abk}
\makeatletter
\newglossarystyle{myindex}{%
\renewenvironment{theglossary}%
{\setlength{\parindent}{0pt}%
\setlength{\parskip}{0pt plus 0.3pt}%
\let\item\@idxitem}%
{}%
\renewcommand*{\glossaryheader}{}%
\renewcommand*{\glsgroupheading}[1]{}%
\renewcommand*{\glossaryentryfield}[5]{%
\item\glstarget{##1}{##2}%
\ifx\relax##4\relax
\else
\space(##4)%
\fi
\dotfill ##3\glspostdescription \space ##5}%
\renewcommand*{\glossarysubentryfield}[6]{%
\ifcase##1\relax
% level 0
\item
\or
% level 1
\subitem
\else
% all other levels
\subsubitem
\fi
\glstarget{##2}{##3}%
\ifx\relax##5\relax
\else
\space(##5)%
\fi
\space##4\glspostdescription\space ##6}%
\renewcommand*{\glsgroupskip}{\indexspace}
\renewcommand*{\glsgroupheading}[1]{%
\item\textbf{\glsgetgrouptitle{##1}}\indexspace}%
}
\makeatother
\twocolumn
\printglossary[title=Akronymverzeichnis,style=myindex]
\end{document}
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