This Proto-Slavic entry contains reconstructed terms and roots. As such, the term(s) in this entry are not directly attested, but are hypothesized to have existed based on comparative evidence.
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From Proto-Balto-Slavic *sen, from Proto-Indo-European *swé; compare Latin . Cognate with Old Prussian sien (oneself).



  1. oneself: myself, yourself, himself, herself, itself (accusative)
  2. ourselves, yourselves, themselves (accusative)
  3. each other (accusative)



  • East Slavic:
    • Belarusian: -ся (-sja) (merges with final "-ць" into "-цца")
    • Russian: -ся (-sja) (after consonants) / -сь (-sʹ) (after vowels)
    • Ukrainian: -ся (-sja) (before consonants) / -сь (-sʹ) (before vowels, unless after most consonants)
  • South Slavic:
  • West Slavic:
    • Old Czech:
      • Czech: se
        • Bohemian (Chod dialect): se
    • Slovak: sa
    • Old Polish: się
    • Kashubian:
    • Sorbian:
      • Lower Sorbian: se
      • Upper Sorbian: so, ?sej