"reaction engine" meaning in English

{
  "forms": [
    {
      "form": "reaction engines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "reaction engine (plural reaction 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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any engine that generates thrust by expelling matter, especially hot gases produced by igniting a fuel; either a rocket engine or several types of jet engine."
      ],
      "id": "en-reaction_engine-en-noun-SG0OECzL",
      "links": [
        [
          "thrust",
          "thrust"
        ],
        [
          "fuel",
          "fuel"
        ],
        [
          "rocket engine",
          "rocket engine"
        ],
        [
          "jet engine",
          "jet engine"
        ]
      ]
    }
  ],
  "word": "reaction engine"
}

{
  "forms": [
    {
      "form": "reaction engines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "reaction engine (plural reaction engines)",
      "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",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Any engine that generates thrust by expelling matter, especially hot gases produced by igniting a fuel; either a rocket engine or several types of jet engine."
      ],
      "links": [
        [
          "thrust",
          "thrust"
        ],
        [
          "fuel",
          "fuel"
        ],
        [
          "rocket engine",
          "rocket engine"
        ],
        [
          "jet engine",
          "jet engine"
        ]
      ]
    }
  ],
  "word": "reaction engine"
}