"reactionless drive" meaning in English

{
  "forms": [
    {
      "form": "reactionless drives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "reactionless drive (plural reactionless drives)",
      "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"
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          "source": "w"
        },
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mechanics",
          "orig": "en:Mechanics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Science fiction",
          "orig": "en:Science fiction",
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            "Speculative fiction",
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            "Genres",
            "Art",
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            "Society",
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Space access",
          "orig": "en:Space access",
          "parents": [
            "Astronautics",
            "Applied sciences",
            "Space",
            "Sciences",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A hypothetical device producing motion without the exhaust of a propellant."
      ],
      "hyponyms": [
        {
          "word": "Dean drive"
        },
        {
          "word": "microwave resonant cavity thruster"
        },
        {
          "word": "resonant cavity thruster"
        }
      ],
      "id": "en-reactionless_drive-en-noun-wIDSql-P",
      "links": [
        [
          "hypothetical",
          "hypothetical"
        ],
        [
          "device",
          "device"
        ],
        [
          "motion",
          "motion"
        ],
        [
          "exhaust",
          "exhaust"
        ],
        [
          "propellant",
          "propellant"
        ]
      ],
      "synonyms": [
        {
          "word": "non-Newtonian drive"
        },
        {
          "word": "space drive"
        },
        {
          "word": "spacedrive"
        },
        {
          "word": "reaction-less drive"
        }
      ]
    }
  ],
  "word": "reactionless drive"
}

{
  "forms": [
    {
      "form": "reactionless drives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "reactionless drive (plural reactionless drives)",
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  ],
  "hyponyms": [
    {
      "word": "Dean drive"
    },
    {
      "word": "microwave resonant cavity thruster"
    },
    {
      "word": "resonant cavity thruster"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Mechanics",
        "en:Science fiction",
        "en:Space access"
      ],
      "glosses": [
        "A hypothetical device producing motion without the exhaust of a propellant."
      ],
      "links": [
        [
          "hypothetical",
          "hypothetical"
        ],
        [
          "device",
          "device"
        ],
        [
          "motion",
          "motion"
        ],
        [
          "exhaust",
          "exhaust"
        ],
        [
          "propellant",
          "propellant"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "non-Newtonian drive"
    },
    {
      "word": "space drive"
    },
    {
      "word": "spacedrive"
    },
    {
      "word": "reaction-less drive"
    }
  ],
  "word": "reactionless drive"
}