Where does “заключительный” come from?

заключительный (Russian) comes from Russian заключи́ть, from Russian за́-, from Proto-Slavic za- — for.

заключительный (Russian): final, last, ultimate

Definitions

  1. final, last, ultimate

Ancestry of “заключительный”, step by step

StepLanguageWordMeaning
1Russianзаключи́тьto conclude, to close, to end
2Russianза́-behind, beyond
3Proto-Slavicza-for
Every word from Proto-Slavic za- →Every word from Russian за́- →Every word from Russian заключи́ть →