"ся" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "sla-pro",
        "2": "*sę"
      },
      "expansion": "Proto-Slavic *sę",
      "name": "cog"
    },
    {
      "args": {
        "1": "cu",
        "2": "сѧ"
      },
      "expansion": "Old Church Slavonic сѧ",
      "name": "cog"
    }
  ],
  "etymology_text": "Contracted from себя́ (sebjá) and probably not a direct descendant of Proto-Slavic *sę (whence -ся (-sja)) or Old Church Slavonic сѧ.",
  "forms": [
    {
      "form": "sja",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "pronoun"
      },
      "expansion": "ся • (sja)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "pron",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "sebjá",
          "word": "себя́"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian pronouns",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Contraction of себя́ (sebjá)."
      ],
      "id": "en-ся-ru-pron--~~jZIaC",
      "links": [
        [
          "себя́",
          "себя#Russian"
        ]
      ],
      "raw_glosses": [
        "(colloquial) Contraction of себя́ (sebjá)."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "colloquial",
        "contraction"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sʲa]"
    },
    {
      "audio": "Ru-ся.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/d8/Ru-%D1%81%D1%8F.ogg/Ru-%D1%81%D1%8F.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/d8/Ru-%D1%81%D1%8F.ogg"
    }
  ],
  "word": "ся"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "sla-pro",
        "2": "*sę"
      },
      "expansion": "Proto-Slavic *sę",
      "name": "cog"
    },
    {
      "args": {
        "1": "cu",
        "2": "сѧ"
      },
      "expansion": "Old Church Slavonic сѧ",
      "name": "cog"
    }
  ],
  "etymology_text": "Contracted from себя́ (sebjá) and probably not a direct descendant of Proto-Slavic *sę (whence -ся (-sja)) or Old Church Slavonic сѧ.",
  "forms": [
    {
      "form": "sja",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "pronoun"
      },
      "expansion": "ся • (sja)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "pron",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "sebjá",
          "word": "себя́"
        }
      ],
      "categories": [
        "Pages with 4 entries",
        "Pages with entries",
        "Russian 1-syllable words",
        "Russian colloquialisms",
        "Russian contractions",
        "Russian entries with incorrect language header",
        "Russian lemmas",
        "Russian pronouns",
        "Russian terms with IPA pronunciation"
      ],
      "glosses": [
        "Contraction of себя́ (sebjá)."
      ],
      "links": [
        [
          "себя́",
          "себя#Russian"
        ]
      ],
      "raw_glosses": [
        "(colloquial) Contraction of себя́ (sebjá)."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "colloquial",
        "contraction"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[sʲa]"
    },
    {
      "audio": "Ru-ся.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/d8/Ru-%D1%81%D1%8F.ogg/Ru-%D1%81%D1%8F.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/d8/Ru-%D1%81%D1%8F.ogg"
    }
  ],
  "word": "ся"
}