"o.s." meaning in English

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  "lang_code": "en",
  "pos": "noun",
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        "Initialism of old series."
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        "(in bibliographies) Initialism of old series."
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  "lang_code": "en",
  "pos": "pron",
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          "word": "oneself"
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        "Initialism of oneself."
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        "(chiefly grammar and lexicography) Initialism of oneself."
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  "word": "o.s."
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  "lang_code": "en",
  "pos": "noun",
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        "Initialism of old series."
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        "(in bibliographies) Initialism of old series."
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  "word": "o.s."
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  "lang": "English",
  "lang_code": "en",
  "pos": "pron",
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        "Initialism of oneself."
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