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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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Note that while OS's is an acceptable plural, it's not the only right answer -- check your style guide if one applies (CMOS and NYT say yes, APA says no, the Guardian implies no by example). English.stackexchange discussion (not the first, probably not the last). – Chris H Oct 5 at 16:22

2 Answers 2

up vote 22 down vote accepted

To define plural exceptions, you can use \acrodefplural:


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



\acro{OS}{Operating System}


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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
When I use this solution the usages of the plural form of that acronym no longer gives a link to the acronym list. Why is that? Can it be solved? – Kajsa Jul 28 at 9:47

To also have the plural show up as a link to the acronym list, enter two acronym entries similar to as such:

\acro{TSE}{transmissible spongiform encephalopathy}
\acrodefplural{TSE}{transmissible spongiform encephalopathies}

Then make sure you reference the acronym in the text body as such:


This will now enter in the text with a link to the acronyms list as such:

"... transmissible spongiform encephalopathies (TSEs) ..."

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Welcome to TeX - LaTeX! Isn't this the same solution as in @Gonzalo's answer (just using a different acronym)? – clemens Oct 5 at 14:25

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