"mapping reduction" meaning in English

{
  "forms": [
    {
      "form": "mapping reductions",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
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      "expansion": "mapping reduction (countable and uncountable, plural mapping reductions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "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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          "name": "Pages with 1 entry",
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      ],
      "glosses": [
        "An algorithm that transforms an instance of one decision problem into another decision problem."
      ],
      "id": "en-mapping_reduction-en-noun-lhoE5vBF",
      "links": [
        [
          "computational complexity theory",
          "computational complexity theory"
        ],
        [
          "algorithm",
          "algorithm"
        ],
        [
          "transform",
          "transform"
        ],
        [
          "instance",
          "instance"
        ],
        [
          "decision problem",
          "decision problem"
        ]
      ],
      "qualifier": "computational complexity theory",
      "raw_glosses": [
        "(computational complexity theory) An algorithm that transforms an instance of one decision problem into another decision problem."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "mapping reduction"
}

{
  "forms": [
    {
      "form": "mapping reductions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "mapping reduction (countable and uncountable, plural mapping reductions)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "An algorithm that transforms an instance of one decision problem into another decision problem."
      ],
      "links": [
        [
          "computational complexity theory",
          "computational complexity theory"
        ],
        [
          "algorithm",
          "algorithm"
        ],
        [
          "transform",
          "transform"
        ],
        [
          "instance",
          "instance"
        ],
        [
          "decision problem",
          "decision problem"
        ]
      ],
      "qualifier": "computational complexity theory",
      "raw_glosses": [
        "(computational complexity theory) An algorithm that transforms an instance of one decision problem into another decision problem."
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "mapping reduction"
}