"siècle-lumière" meaning in French

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      "expansion": "Calque of English light century",
      "name": "calque"
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  ],
  "etymology_text": "Calque of English light century.",
  "forms": [
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      "form": "siècles-lumière",
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  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
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        {
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          "langcode": "fr",
          "name": "Astrophysics",
          "orig": "fr:Astrophysics",
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            "Astronomy",
            "Physics",
            "Sciences",
            "Space",
            "All topics",
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        },
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          "name": "Units of measure",
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            "Quantity",
            "Applied sciences",
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      ],
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        "light century (astronomical distance)"
      ],
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        [
          "light century",
          "light century"
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      ],
      "related": [
        {
          "word": "seconde-lumière"
        },
        {
          "word": "minute-lumière"
        },
        {
          "word": "heure-lumière"
        },
        {
          "word": "jour-lumière"
        },
        {
          "word": "année-lumière"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/sjɛ.klə.ly.mjɛʁ/"
    },
    {
      "ipa": "/sje.klə.ly.mjɛʁ/"
    },
    {
      "ipa": "/sjɛ.k‿ly.mjɛʁ/"
    },
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      "rhymes": "-ɛʁ"
    }
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  "word": "siècle-lumière"
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  ],
  "etymology_text": "Calque of English light century.",
  "forms": [
    {
      "form": "siècles-lumière",
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        "plural"
      ]
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  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "related": [
    {
      "word": "seconde-lumière"
    },
    {
      "word": "minute-lumière"
    },
    {
      "word": "heure-lumière"
    },
    {
      "word": "jour-lumière"
    },
    {
      "word": "année-lumière"
    }
  ],
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      ],
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  ],
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    {
      "ipa": "/sjɛ.klə.ly.mjɛʁ/"
    },
    {
      "ipa": "/sje.klə.ly.mjɛʁ/"
    },
    {
      "ipa": "/sjɛ.k‿ly.mjɛʁ/"
    },
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    },
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      "rhymes": "-ɛʁ"
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  "word": "siècle-lumière"
}