"zero-length" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "zero-length (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Military",
          "orig": "en:Military",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "62 38",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "zero-length launch system; zero-length take-off"
        }
      ],
      "glosses": [
        "Being or relating to a method whereby jet fighters and attack aircraft could be near-vertically launched using rocket motors to rapidly gain speed and altitude."
      ],
      "id": "en-zero-length-en-adj-rRO6zI0W",
      "links": [
        [
          "military",
          "military"
        ],
        [
          "jet fighter",
          "jet fighter"
        ],
        [
          "attack",
          "attack"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(military) Being or relating to a method whereby jet fighters and attack aircraft could be near-vertically launched using rocket motors to rapidly gain speed and altitude."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Programming",
          "orig": "en:Programming",
          "parents": [
            "Computing",
            "Software engineering",
            "Technology",
            "Computer science",
            "Engineering",
            "Software",
            "All topics",
            "Sciences",
            "Applied sciences",
            "Media",
            "Fundamental",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a zero-length array; a zero-length string"
        }
      ],
      "glosses": [
        "Having a length of zero; containing no elements, text characters, etc."
      ],
      "id": "en-zero-length-en-adj-yftvLWHk",
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "element",
          "element"
        ],
        [
          "text",
          "text"
        ],
        [
          "character",
          "character"
        ]
      ],
      "raw_glosses": [
        "(programming) Having a length of zero; containing no elements, text characters, etc."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    }
  ],
  "word": "zero-length"
}

{
  "categories": [
    "English adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English uncomparable adjectives"
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "zero-length (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "en:Military"
      ],
      "examples": [
        {
          "text": "zero-length launch system; zero-length take-off"
        }
      ],
      "glosses": [
        "Being or relating to a method whereby jet fighters and attack aircraft could be near-vertically launched using rocket motors to rapidly gain speed and altitude."
      ],
      "links": [
        [
          "military",
          "military"
        ],
        [
          "jet fighter",
          "jet fighter"
        ],
        [
          "attack",
          "attack"
        ],
        [
          "aircraft",
          "aircraft"
        ]
      ],
      "raw_glosses": [
        "(military) Being or relating to a method whereby jet fighters and attack aircraft could be near-vertically launched using rocket motors to rapidly gain speed and altitude."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "government",
        "military",
        "politics",
        "war"
      ]
    },
    {
      "categories": [
        "en:Programming"
      ],
      "examples": [
        {
          "text": "a zero-length array; a zero-length string"
        }
      ],
      "glosses": [
        "Having a length of zero; containing no elements, text characters, etc."
      ],
      "links": [
        [
          "programming",
          "programming#Noun"
        ],
        [
          "element",
          "element"
        ],
        [
          "text",
          "text"
        ],
        [
          "character",
          "character"
        ]
      ],
      "raw_glosses": [
        "(programming) Having a length of zero; containing no elements, text characters, etc."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "programming",
        "sciences"
      ]
    }
  ],
  "word": "zero-length"
}