Latin past paticiple/supinum


Senior Member

In Latin the past participle (and supinum) is formed typically by the morpheme -t-, for example amatus,-a,-um; datus,-a,-um etc .... In some cases, however, we have -s-, for example occisus, decisus, etc ....

My question is, if in case of -s- it's an IndoEuropean heritage, or simply a Latin "innovation" due to some kind of phonetic changes, like e.g. occisus < *occidtus ....

Thanks in advance.
  • The second: in Latin *tt>*tst>ss (>s after a long syllable). The same rule operated in Celtic and Germanic, though in Germanic st at the attested stages is often found by analogy instead (for example, Gothic has witan : wiss but gamotan : gamosts).

    P. S. This change did not affect the emphatic t: in words like atta (compare also in Slavic: *attikos>otьcь, instead of *ostьcь, as *tt>st in Slavic).