"полпервого" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "пол-",
        "3": "пе́рвый",
        "t1": "half past",
        "t2": "first"
      },
      "expansion": "пол- (pol-, “half past”) + пе́рвый (pérvyj, “first”)",
      "name": "af"
    },
    {
      "args": {
        "1": "de",
        "2": "halb eins",
        "3": "",
        "4": "half past twelve",
        "lit": "half one"
      },
      "expansion": "German halb eins (“half past twelve”, literally “half one”)",
      "name": "cog"
    }
  ],
  "etymology_text": "пол- (pol-, “half past”) + пе́рвый (pérvyj, “first”), with пе́рвый (pérvyj) in the genitive case, as with other words prefixed with пол- (pol-). Compare German halb eins (“half past twelve”, literally “half one”).",
  "forms": [
    {
      "form": "полпе́рвого",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "polpérvovo",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "полпе́рвого",
        "2": "n-in",
        "3": "-",
        "tr": "polpérvovo"
      },
      "expansion": "полпе́рвого • (polpérvovo) n inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "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 terms prefixed with пол-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian terms with non-redundant manual transliterations",
          "parents": [
            "Terms with non-redundant manual transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "half past twelve, twelve-thirty (hour of the day)"
      ],
      "id": "en-полпервого-ru-noun-dGgNWndf",
      "links": [
        [
          "half past",
          "half past"
        ],
        [
          "twelve",
          "twelve"
        ],
        [
          "twelve-thirty",
          "twelve-thirty"
        ]
      ],
      "raw_glosses": [
        "(colloquial) half past twelve, twelve-thirty (hour of the day)"
      ],
      "tags": [
        "colloquial",
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˌpoɫˈpʲervəvə]"
    }
  ],
  "word": "полпервого"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "пол-",
        "3": "пе́рвый",
        "t1": "half past",
        "t2": "first"
      },
      "expansion": "пол- (pol-, “half past”) + пе́рвый (pérvyj, “first”)",
      "name": "af"
    },
    {
      "args": {
        "1": "de",
        "2": "halb eins",
        "3": "",
        "4": "half past twelve",
        "lit": "half one"
      },
      "expansion": "German halb eins (“half past twelve”, literally “half one”)",
      "name": "cog"
    }
  ],
  "etymology_text": "пол- (pol-, “half past”) + пе́рвый (pérvyj, “first”), with пе́рвый (pérvyj) in the genitive case, as with other words prefixed with пол- (pol-). Compare German halb eins (“half past twelve”, literally “half one”).",
  "forms": [
    {
      "form": "полпе́рвого",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "polpérvovo",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "полпе́рвого",
        "2": "n-in",
        "3": "-",
        "tr": "polpérvovo"
      },
      "expansion": "полпе́рвого • (polpérvovo) n inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Russian 4-syllable words",
        "Russian colloquialisms",
        "Russian entries with incorrect language header",
        "Russian inanimate nouns",
        "Russian indeclinable nouns",
        "Russian lemmas",
        "Russian neuter nouns",
        "Russian nouns",
        "Russian terms prefixed with пол-",
        "Russian terms with IPA pronunciation",
        "Russian terms with non-redundant manual transliterations"
      ],
      "glosses": [
        "half past twelve, twelve-thirty (hour of the day)"
      ],
      "links": [
        [
          "half past",
          "half past"
        ],
        [
          "twelve",
          "twelve"
        ],
        [
          "twelve-thirty",
          "twelve-thirty"
        ]
      ],
      "raw_glosses": [
        "(colloquial) half past twelve, twelve-thirty (hour of the day)"
      ],
      "tags": [
        "colloquial",
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˌpoɫˈpʲervəvə]"
    }
  ],
  "word": "полпервого"
}