"sporadic E" meaning in All languages combined

{
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    {
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      "expansion": "sporadic E (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"
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          "source": "w"
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          "source": "w"
        },
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          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Radio",
          "orig": "en:Radio",
          "parents": [
            "Telecommunications",
            "Communication",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A meteorological phenomenon where radio waves above a certain frequency are reflected in the atmospheric E region, allowing these radio waves to be received in distances up to 1,200 miles."
      ],
      "id": "en-sporadic_E-en-noun-ZCVng5m3",
      "links": [
        [
          "radio",
          "radio"
        ],
        [
          "E region",
          "E region"
        ]
      ],
      "raw_glosses": [
        "(radio) A meteorological phenomenon where radio waves above a certain frequency are reflected in the atmospheric E region, allowing these radio waves to be received in distances up to 1,200 miles."
      ],
      "synonyms": [
        {
          "word": "sporadic-E"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "broadcasting",
        "media",
        "radio"
      ]
    }
  ],
  "word": "sporadic E"
}

{
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      "expansion": "sporadic E (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
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        "English multiword terms",
        "English nouns",
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        "en:Radio"
      ],
      "glosses": [
        "A meteorological phenomenon where radio waves above a certain frequency are reflected in the atmospheric E region, allowing these radio waves to be received in distances up to 1,200 miles."
      ],
      "links": [
        [
          "radio",
          "radio"
        ],
        [
          "E region",
          "E region"
        ]
      ],
      "raw_glosses": [
        "(radio) A meteorological phenomenon where radio waves above a certain frequency are reflected in the atmospheric E region, allowing these radio waves to be received in distances up to 1,200 miles."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "broadcasting",
        "media",
        "radio"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "sporadic-E"
    }
  ],
  "word": "sporadic E"
}