"civil twilight" meaning in English

{
  "forms": [
    {
      "form": "civil twilights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "civil twilight (countable and uncountable, plural civil twilights)",
      "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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          "kind": "other",
          "name": "Entries with translation boxes",
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        {
          "kind": "other",
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          "kind": "other",
          "name": "Terms with Finnish translations",
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Icelandic translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Japanese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Korean translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Times of day",
          "orig": "en:Times of day",
          "parents": [
            "Periodic occurrences",
            "Timekeeping",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The period in which the sun is less than 6° below the horizon in the morning and evening."
      ],
      "id": "en-civil_twilight-en-noun-mYgrvGVz",
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "period in which the sun is less than 6° below the horizon",
          "tags": [
            "feminine"
          ],
          "word": "burgerlijke schemering"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "period in which the sun is less than 6° below the horizon",
          "word": "porvarillinen hämärä"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "period in which the sun is less than 6° below the horizon",
          "tags": [
            "feminine"
          ],
          "word": "bürgerliche Dämmerung"
        },
        {
          "code": "is",
          "lang": "Icelandic",
          "sense": "period in which the sun is less than 6° below the horizon",
          "tags": [
            "neuter"
          ],
          "word": "almannarökkur"
        },
        {
          "alt": "しみんはくめい",
          "code": "ja",
          "lang": "Japanese",
          "roman": "shimin hakumei",
          "sense": "period in which the sun is less than 6° below the horizon",
          "word": "市民薄明"
        },
        {
          "code": "ko",
          "lang": "Korean",
          "roman": "siminbangmyeong",
          "sense": "period in which the sun is less than 6° below the horizon",
          "word": "시민박명"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "graždanskije sumerki",
          "sense": "period in which the sun is less than 6° below the horizon",
          "tags": [
            "feminine",
            "plural"
          ],
          "word": "гражданские сумерки"
        }
      ]
    }
  ],
  "word": "civil twilight"
}

{
  "forms": [
    {
      "form": "civil twilights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "civil twilight (countable and uncountable, plural civil twilights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Dutch translations",
        "Terms with Finnish translations",
        "Terms with German translations",
        "Terms with Icelandic translations",
        "Terms with Japanese translations",
        "Terms with Korean translations",
        "Terms with Russian translations",
        "en:Times of day"
      ],
      "glosses": [
        "The period in which the sun is less than 6° below the horizon in the morning and evening."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "period in which the sun is less than 6° below the horizon",
      "tags": [
        "feminine"
      ],
      "word": "burgerlijke schemering"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "period in which the sun is less than 6° below the horizon",
      "word": "porvarillinen hämärä"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "period in which the sun is less than 6° below the horizon",
      "tags": [
        "feminine"
      ],
      "word": "bürgerliche Dämmerung"
    },
    {
      "code": "is",
      "lang": "Icelandic",
      "sense": "period in which the sun is less than 6° below the horizon",
      "tags": [
        "neuter"
      ],
      "word": "almannarökkur"
    },
    {
      "alt": "しみんはくめい",
      "code": "ja",
      "lang": "Japanese",
      "roman": "shimin hakumei",
      "sense": "period in which the sun is less than 6° below the horizon",
      "word": "市民薄明"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "siminbangmyeong",
      "sense": "period in which the sun is less than 6° below the horizon",
      "word": "시민박명"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "graždanskije sumerki",
      "sense": "period in which the sun is less than 6° below the horizon",
      "tags": [
        "feminine",
        "plural"
      ],
      "word": "гражданские сумерки"
    }
  ],
  "word": "civil twilight"
}