Where does “действенность” come from?

действенность (Russian) comes from Russian де́йственный, from Russian -е́нный, from Old Church Slavonic -еньнъ.

действенность (Russian): efficacy, efficiency

Definitions

  1. efficacy, efficiency

Ancestry of “действенность”, step by step

StepLanguageWordMeaning
1Russianде́йственныйeffective
2Russian-е́нныйused to form past passive participles from verbs in
3Old Church Slavonic-еньнъ—
Every word from Old Church Slavonic -еньнъ →Every word from Russian -е́нный →Every word from Russian де́йственный →