Reconstruction:Proto-Slavic/otьcь

Etymology
Most probably an early agent noun from native.

Noun

 * 1)  father, patriarch

Usage notes
Following the Christianization of Early Slavs, in many languages the reflexes of became calques of,  (whence 🇨🇬) and are used as an appellation to ecclesiastical figures (priests, clerics, bishops, etc.).

Descendants
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 * Non-Slavic: