"illumination problem" meaning in All languages combined

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    {
      "args": {
        "1": "en",
        "2": "illumination",
        "3": "problem"
      },
      "expansion": "illumination + problem",
      "name": "com"
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  ],
  "etymology_text": "illumination + problem",
  "head_templates": [
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      "args": {
        "1": "?"
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      "expansion": "illumination problem",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
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      "glosses": [
        "A mathematical problem, asking whether a room with mirrored walls can always be illuminated by a single-point light source, allowing for repeated reflection of light off the mirrored walls. It was solved in 1958: there are such rooms that cannot be thus illuminated."
      ],
      "id": "en-illumination_problem-en-noun-A8Nrgt5L",
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      "raw_glosses": [
        "(mathematics) A mathematical problem, asking whether a room with mirrored walls can always be illuminated by a single-point light source, allowing for repeated reflection of light off the mirrored walls. It was solved in 1958: there are such rooms that cannot be thus illuminated."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "illumination problem"
      ]
    }
  ],
  "word": "illumination problem"
}

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        "2": "illumination",
        "3": "problem"
      },
      "expansion": "illumination + problem",
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  ],
  "etymology_text": "illumination + problem",
  "head_templates": [
    {
      "args": {
        "1": "?"
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      "expansion": "illumination problem",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English terms derived from Proto-Indo-European",
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      "glosses": [
        "A mathematical problem, asking whether a room with mirrored walls can always be illuminated by a single-point light source, allowing for repeated reflection of light off the mirrored walls. It was solved in 1958: there are such rooms that cannot be thus illuminated."
      ],
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      "raw_glosses": [
        "(mathematics) A mathematical problem, asking whether a room with mirrored walls can always be illuminated by a single-point light source, allowing for repeated reflection of light off the mirrored walls. It was solved in 1958: there are such rooms that cannot be thus illuminated."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "illumination problem"
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  "word": "illumination problem"
}