I have the following abbreviation:

TIS - Traffic Information System

The plural form of this abbreviation remains as TIS although the abbreviated sentence gets the "s" in the end


TIS - Traffic Information Systems

How can I cover this use case using the acro package for abbreviations

  • 1
    Can you add a minimal working example (MWE)? (By the way, I removed latex3 -- that's a separate topic which you can read about on the tag wiki.) Jul 17, 2015 at 18:09

1 Answer 1


As explained in section 4.3 Plural Forms of the acro manual you can set a custom plural ending for a short form. In this case just set it empty:



  short = TIS ,
  long = Traffic Information System ,
  short-plural = ,





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  • I read the manual, but could not quite understand what does the f represent. In fact what does "first form; output like the first time \ac is output " mean? can you expand explanation please Jul 18, 2015 at 20:15
  • 2
    @KristofTak if you use \ac{foo} several times in the text then the first appearance prints something different than the further uses. The default first appearance is <long form> (<short form>) (but this is adaptable) while in all further uses only the short form is printed. In order to get the same appearance again as in the first time acro defines \acf.
    – cgnieder
    Jul 18, 2015 at 20:51

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