Where does “-а́чий” come from?

-а́чий (Ukrainian) comes from Proto-Slavic *-ęťь — used after imperfective verb stems (i.e. in *-iti, *-ěti and *-ati verbs).

Ancestry of “-а́чий”, step by step

StepLanguageWordMeaning
1Proto-Slavic*-ęťьused after imperfective verb stems (i.e. in *-iti, *-ěti and *-ati verbs)

Words derived from “-а́чий

Every word from Proto-Slavic *-ęťь