się (Polish)

Where does "się" come from?

Polish 'się', the reflexive particle used to form impersonal present and future constructions, descends from Proto-Indo-European '*swé'[4], a stem that originally served as a reflexive element referring to all persons and numbers. It passed through Proto-Balto-Slavic '*sen'[3] and Proto-Slavic '*sę'[2], and appears as Old Polish 'się', first attested in the 14th century[5], before reaching its modern Polish form[1]. The Homeric Greek use of 'hós' to mean 'my own' or 'your own' preserves a trace of the stem's older, wider reflexive sense[4].

Open questions

The Proto-Indo-European and Proto-Balto-Slavic forms are reconstructed rather than directly attested in written texts. [3] [4]
The source gives the 14th century as the first attestation of Old Polish 'się' without a specific text or date, so the earliest written record may be older or more precisely dated than stated. [5]

Full etymology tree

się (Polish), 'used to form impersonal present or future tense'
- inherited się (Old Polish), 'reflexive pronoun; oneself, self'
  - inherited *sę (Proto-Slavic), 'oneself: myself, yourself, himself, herself, itself (accusative)'
    - inherited *sen (Proto-Balto-Slavic), 'oneself'
      - inherited *swé (Proto-Indo-European), 'self (reflexive pronoun)'

Sources

Updated October 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris