Where does “тайна” come from?

тайна (Russian) comes from Serbo-Croatian tȃjna, from Proto-Slavic *tajьna — secret, mystery.

тайна (Russian): mystery; secret; secrecy

Definitions

  1. mystery; secret; secrecy

Ancestry of “тайна”, step by step

тайна traces back through two separate lines of ancestry.

via Serbo-Croatian tȃjna

StepLanguageWordMeaning
1Serbo-Croatiantȃjnasecret
2Proto-Slavic*tajьnasecret, mystery

via Old East Slavic таина

StepLanguageWordMeaning
1Old East Slavicтаина—
Every word from Proto-Slavic *tajьna →Every word from Serbo-Croatian tȃjna →