"bissextile month" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bissextile"
      },
      "expansion": "bissextile",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "month"
      },
      "expansion": "month",
      "name": "m"
    }
  ],
  "etymology_text": "From bissextile + month.",
  "forms": [
    {
      "form": "bissextile months",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bissextile month (plural bissextile months)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Calendar",
          "orig": "en:Calendar",
          "parents": [
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A month with an extra day in a leap year."
      ],
      "id": "en-bissextile_month-en-noun-NOS3U7dE",
      "links": [
        [
          "leap year",
          "leap year"
        ]
      ],
      "related": [
        {
          "word": "bissextile"
        },
        {
          "word": "bissextile year"
        },
        {
          "word": "intercalate"
        },
        {
          "word": "leap day"
        },
        {
          "word": "leap year"
        }
      ],
      "translations": [
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "a month with an extra day in a leap year",
          "tags": [
            "feminine"
          ],
          "word": "lună bisectilă"
        },
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "a month with an extra day in a leap year",
          "tags": [
            "feminine"
          ],
          "word": "lună bisectă"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "a month with an extra day in a leap year",
          "tags": [
            "common-gender"
          ],
          "word": "skottmånad"
        }
      ]
    }
  ],
  "word": "bissextile month"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "bissextile"
      },
      "expansion": "bissextile",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "month"
      },
      "expansion": "month",
      "name": "m"
    }
  ],
  "etymology_text": "From bissextile + month.",
  "forms": [
    {
      "form": "bissextile months",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bissextile month (plural bissextile months)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "bissextile"
    },
    {
      "word": "bissextile year"
    },
    {
      "word": "intercalate"
    },
    {
      "word": "leap day"
    },
    {
      "word": "leap year"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from Latin",
        "English terms with non-redundant non-automated sortkeys",
        "en:Calendar"
      ],
      "glosses": [
        "A month with an extra day in a leap year."
      ],
      "links": [
        [
          "leap year",
          "leap year"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "a month with an extra day in a leap year",
      "tags": [
        "feminine"
      ],
      "word": "lună bisectilă"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "a month with an extra day in a leap year",
      "tags": [
        "feminine"
      ],
      "word": "lună bisectă"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "a month with an extra day in a leap year",
      "tags": [
        "common-gender"
      ],
      "word": "skottmånad"
    }
  ],
  "word": "bissextile month"
}