Where does “первоочередной” come from?

первоочередной (Russian) comes from Russian очередно́й, from Russian о́чередь, from Russian о-, from Proto-Slavic o(b), from Proto-Balto-Slavic ab, from Proto-Indo-European h₃ebʰi.

первоочередной (Russian): first and foremost, immediate

Definitions

  1. first and foremost, immediate

Ancestry of “первоочередной”, step by step

первоочередной traces back through two separate lines of ancestry.

via Russian очередно́й

StepLanguageWordMeaning
1Russianочередно́йnext in an order or sequence
2Russianо́чередьturn, order, rank
3Russianо-prefix added to adjectives or nouns to produce...
4Proto-Slavico(b)around, about; concerning; against, on
5Proto-Balto-Slavicab
6Proto-Indo-Europeanh₃ebʰi

via Russian пе́рвый

StepLanguageWordMeaning
1Russianпе́рвыйfirst
Every word from Proto-Indo-European h₃ebʰiEvery word from Russian о-Every word from Proto-Balto-Slavic ab