"bignae" meaning in Latin

{
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        "1": "la",
        "2": "bi-",
        "3": "-gnus",
        "t1": "two-",
        "t2": "-born"
      },
      "expansion": "bi- (“two-”) + -gnus (“-born”)",
      "name": "af"
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  "etymology_text": "From bi- (“two-”) + -gnus (“-born”).",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "adjective",
        "g": "f-p"
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      "expansion": "bignae f pl",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "parents": [],
          "source": "w"
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          "source": "w"
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          "english": "Twins are called bignae, because two are born in a single day.",
          "ref": "[1839 [8th century CE], Paulus Diaconus, edited by Karl Otfried Müller, Excerpta ex libris Pompeii Festi De significatione verborum, page 33:",
          "text": "Bignae geminae dicuntur, quia bis una die natae sunt.",
          "type": "quote"
        }
      ],
      "glosses": [
        "twin (nominative plural feminine)"
      ],
      "id": "en-bignae-la-adj-kcBeODS5",
      "links": [
        [
          "twin",
          "twin"
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      "raw_glosses": [
        "(hapax legomenon) twin (nominative plural feminine)"
      ],
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "word": "bignae"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "bi-",
        "3": "-gnus",
        "t1": "two-",
        "t2": "-born"
      },
      "expansion": "bi- (“two-”) + -gnus (“-born”)",
      "name": "af"
    }
  ],
  "etymology_text": "From bi- (“two-”) + -gnus (“-born”).",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "adjective",
        "g": "f-p"
      },
      "expansion": "bignae f pl",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "adj",
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        "Latin hapax legomena",
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          "english": "Twins are called bignae, because two are born in a single day.",
          "ref": "[1839 [8th century CE], Paulus Diaconus, edited by Karl Otfried Müller, Excerpta ex libris Pompeii Festi De significatione verborum, page 33:",
          "text": "Bignae geminae dicuntur, quia bis una die natae sunt.",
          "type": "quote"
        }
      ],
      "glosses": [
        "twin (nominative plural feminine)"
      ],
      "links": [
        [
          "twin",
          "twin"
        ]
      ],
      "raw_glosses": [
        "(hapax legomenon) twin (nominative plural feminine)"
      ],
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "word": "bignae"
}