"commonest" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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          "ref": "2021 December 15, Philip Haigh, “Remaining ECML upgrades in the 'really difficult' category”, in RAIL, number 946, page 53:",
          "text": "The commonest theme in these upgrades has been to create capacity for long-distance trains by diverting local services and slower freight.",
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          "extra": "most common",
          "word": "common"
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        "superlative form of common: most common"
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  "word": "commonest"
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  "lang_code": "en",
  "pos": "adj",
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        {
          "ref": "2021 December 15, Philip Haigh, “Remaining ECML upgrades in the 'really difficult' category”, in RAIL, number 946, page 53:",
          "text": "The commonest theme in these upgrades has been to create capacity for long-distance trains by diverting local services and slower freight.",
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