"o-dark-thirty" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "o'"
      },
      "expansion": "o'",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "o'clock"
      },
      "expansion": "o'clock",
      "name": "m"
    }
  ],
  "etymology_text": "By analogy with \"o-three-thirty\" (0330), \"o-four-thirty\" (0430), \"o-five-thirty\" (0530), and similar times as often expressed on the 24-hour clock—early morning hours that archetypally share the characteristics of a still-dark/nighttime sky and a distastefully early time of rising/arousal; the letter o in these terms comes from the /oʊ/-for-zero pronunciation, which (despite its conflated nature) is idiomatically widespread (just as it also is in \"two-point-oh\" for \"2.0\", for example); thus, it is not homologous to the o' in o'clock.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "o-dark-thirty (uncountable)",
      "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"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The wee hours."
      ],
      "id": "en-o-dark-thirty-en-noun-C6-gBlA5",
      "links": [
        [
          "wee hours",
          "wee hours"
        ]
      ],
      "raw_glosses": [
        "(informal) The wee hours."
      ],
      "tags": [
        "informal",
        "uncountable"
      ],
      "wikipedia": [
        "24-hour clock"
      ]
    }
  ],
  "word": "o-dark-thirty"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "o'"
      },
      "expansion": "o'",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "o'clock"
      },
      "expansion": "o'clock",
      "name": "m"
    }
  ],
  "etymology_text": "By analogy with \"o-three-thirty\" (0330), \"o-four-thirty\" (0430), \"o-five-thirty\" (0530), and similar times as often expressed on the 24-hour clock—early morning hours that archetypally share the characteristics of a still-dark/nighttime sky and a distastefully early time of rising/arousal; the letter o in these terms comes from the /oʊ/-for-zero pronunciation, which (despite its conflated nature) is idiomatically widespread (just as it also is in \"two-point-oh\" for \"2.0\", for example); thus, it is not homologous to the o' in o'clock.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "o-dark-thirty (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns"
      ],
      "glosses": [
        "The wee hours."
      ],
      "links": [
        [
          "wee hours",
          "wee hours"
        ]
      ],
      "raw_glosses": [
        "(informal) The wee hours."
      ],
      "tags": [
        "informal",
        "uncountable"
      ],
      "wikipedia": [
        "24-hour clock"
      ]
    }
  ],
  "word": "o-dark-thirty"
}