# How to pluralize an acronym which ends in 'S' correctly?

When using the acronym package, how can you correctly pluralize an acronym which ends on 'S'?

Take the acronym: OS - operating system

It should be pluralized as OS's, but is pluralized as OSs when using \acp.

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To define plural exceptions, you can use \acrodefplural:

\documentclass{article}
\usepackage{acronym}

\acrodefplural{OS}[OS's]{Operating Systems}

\begin{document}

\acp{OS}

\begin{acronym}
\acro{OS}{Operating System}
\end{acronym}

\end{document}


More information can be found on Section 2.3.1 Non standard and foreign plural forms of the acronym package documentation.

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It's so difficult to google for this stuff. I remember googling for "latex acronym plural exception" and nothing interesting showed up. Perhaps it's just a matter of knowing where to look, and TeX is a great help! Thanks. –  Steven Jeuris Dec 17 '11 at 20:16
@StevenJeuris: You're welcome! Now, thanks to your question, if I google for "latex acronym plural exception", this question appears in the second place, so now other users will find a quick solution ;-) –  Gonzalo Medina Dec 17 '11 at 20:20