"difference engine" meaning in English

{
  "forms": [
    {
      "form": "difference engines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "difference engine (plural difference engines)",
      "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"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Computing",
          "orig": "en:Computing",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A mechanical special-purpose computer used to generate tables of values of polynomials."
      ],
      "id": "en-difference_engine-en-noun--HaKH10n",
      "links": [
        [
          "computing",
          "computing#Noun"
        ],
        [
          "polynomial",
          "polynomial"
        ]
      ],
      "raw_glosses": [
        "(computing, historical) A mechanical special-purpose computer used to generate tables of values of polynomials."
      ],
      "related": [
        {
          "word": "analytical engine"
        }
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "computer",
          "word": "差分機"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "chāfēnjī",
          "sense": "computer",
          "word": "差分机"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "computer",
          "word": "differenssikone"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "computer",
          "tags": [
            "feminine"
          ],
          "word": "Differenzmaschine"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "computer",
          "word": "differenciálgép"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "kaisa kikan",
          "sense": "computer",
          "word": "階差機関"
        },
        {
          "code": "ko",
          "lang": "Korean",
          "roman": "chabun'gigwan",
          "sense": "computer",
          "word": "차분기관"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "computer",
          "tags": [
            "feminine"
          ],
          "word": "máquina diferencial"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "computer",
          "tags": [
            "feminine"
          ],
          "word": "máquina diferencial"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "computer",
          "tags": [
            "common-gender"
          ],
          "word": "differensmaskin"
        }
      ],
      "wikipedia": [
        "difference engine"
      ]
    }
  ],
  "word": "difference engine"
}

{
  "forms": [
    {
      "form": "difference engines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "difference engine (plural difference engines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "analytical engine"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "Japanese terms with redundant script codes",
        "en:Computing"
      ],
      "glosses": [
        "A mechanical special-purpose computer used to generate tables of values of polynomials."
      ],
      "links": [
        [
          "computing",
          "computing#Noun"
        ],
        [
          "polynomial",
          "polynomial"
        ]
      ],
      "raw_glosses": [
        "(computing, historical) A mechanical special-purpose computer used to generate tables of values of polynomials."
      ],
      "tags": [
        "historical"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ],
      "wikipedia": [
        "difference engine"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "computer",
      "word": "差分機"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "chāfēnjī",
      "sense": "computer",
      "word": "差分机"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "computer",
      "word": "differenssikone"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "computer",
      "tags": [
        "feminine"
      ],
      "word": "Differenzmaschine"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "computer",
      "word": "differenciálgép"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "kaisa kikan",
      "sense": "computer",
      "word": "階差機関"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "chabun'gigwan",
      "sense": "computer",
      "word": "차분기관"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "computer",
      "tags": [
        "feminine"
      ],
      "word": "máquina diferencial"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "computer",
      "tags": [
        "feminine"
      ],
      "word": "máquina diferencial"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "computer",
      "tags": [
        "common-gender"
      ],
      "word": "differensmaskin"
    }
  ],
  "word": "difference engine"
}