"operational research" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de operational et de research."
  ],
  "forms": [
    {
      "form": "operations research",
      "raw_tags": [
        "États-Unis"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "related": [
    {
      "sense": "aide à la décision",
      "word": "decision theory"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Anglais du Royaume-Uni",
          "orig": "anglais du Royaume-Uni",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Recherche opérationnelle."
      ],
      "id": "fr-operational_research-en-noun-CZnlFF2T",
      "raw_tags": [
        "Royaume-Uni"
      ]
    }
  ],
  "word": "operational research"
}

{
  "categories": [
    "Compositions en anglais",
    "Locutions nominales en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Composé de operational et de research."
  ],
  "forms": [
    {
      "form": "operations research",
      "raw_tags": [
        "États-Unis"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "related": [
    {
      "sense": "aide à la décision",
      "word": "decision theory"
    }
  ],
  "senses": [
    {
      "categories": [
        "anglais du Royaume-Uni"
      ],
      "glosses": [
        "Recherche opérationnelle."
      ],
      "raw_tags": [
        "Royaume-Uni"
      ]
    }
  ],
  "word": "operational research"
}