Where does “обязательность” come from?

обязательность (Russian) comes from Russian -ость, from Proto-Slavic -ostь — Used with adjectival stems to form abstract...

обязательность (Russian): obligatoriness, obligation; compulsion

Definitions

  1. obligatoriness, obligation; compulsion

Ancestry of “обязательность”, step by step

StepLanguageWordMeaning
1Russian-ость-ness, -ity
2Proto-Slavic-ostьUsed with adjectival stems to form abstract...
Every word from Proto-Slavic -ostь →Every word from Russian -ость →