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English

From the traditional Ashkenazi pronunciation of Hebrew ־וֹת (-ót), and its Yiddish [Term?] reflex.

Aromanian

From Latin -ōsus.

Esperanto

The Esperanto suffixes -as, -is, -os, -us are related, and appear to have been inspired by previous language projects:

This play of vowels is not an original idea of Zamenhof's: -as, -is, -os are found for the three tenses of the infinitive in Faiguet's system of 1765; -a, -i, -o without a consonant are used like Z's -as, -is, -os by Rudelle (1858); Courtonne in 1885 had -am, -im, -om in the same values, and the similarity with Esperanto is here even more perfect than in the other projects, as -um corresponds to Z's -us.An International Language (1928)

Ido

Borrowed from Esperanto -os, back-formation from -as.

Romanian

From Latin -ōsus (full (of)).