"nula" meaning in Esperanto

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "nulo",
        "3": "-a",
        "t1": "zero"
      },
      "expansion": "nulo (“zero”) + -a",
      "name": "af"
    }
  ],
  "etymology_text": "From nulo (“zero”) + -a.",
  "forms": [
    {
      "form": "nulan",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "nulaj",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "nulajn",
      "tags": [
        "accusative",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nula (accusative singular nulan, plural nulaj, accusative plural nulajn)",
      "name": "eo-head"
    }
  ],
  "hyphenation": [
    "nu‧la"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "adj",
  "senses": [
    {
      "glosses": [
        "without value, nonexistent"
      ],
      "id": "en-nula-eo-adj-FkJZ4BkD",
      "links": [
        [
          "nonexistent",
          "nonexistent"
        ]
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "eo",
          "name": "Mathematics",
          "orig": "eo:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "13 68 20",
          "kind": "other",
          "name": "Esperanto entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "18 78 4",
          "kind": "other",
          "name": "Esperanto terms suffixed with -a",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "17 78 5",
          "kind": "other",
          "name": "Pages with 8 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "17 78 5",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "equal to zero (of angles and mathematical functions)"
      ],
      "id": "en-nula-eo-adj--1qG2Ap-",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "zero",
          "zero"
        ],
        [
          "angle",
          "angle"
        ],
        [
          "function",
          "function"
        ]
      ],
      "raw_glosses": [
        "(mathematics) equal to zero (of angles and mathematical functions)"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "name": "Esperanto ordinal numbers",
          "parents": [
            "Ordinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "zeroth"
      ],
      "id": "en-nula-eo-adj-fPRnr~uI",
      "links": [
        [
          "ordinal number",
          "ordinal number"
        ],
        [
          "zeroth",
          "zeroth"
        ]
      ],
      "raw_glosses": [
        "(ordinal number) zeroth"
      ],
      "tags": [
        "numeral",
        "ordinal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈnula]"
    },
    {
      "rhymes": "-ula"
    }
  ],
  "word": "nula"
}

{
  "categories": [
    "Esperanto adjectives",
    "Esperanto entries with incorrect language header",
    "Esperanto lemmas",
    "Esperanto terms suffixed with -a",
    "Esperanto terms with IPA pronunciation",
    "Esperanto terms with audio pronunciation",
    "Pages with 8 entries",
    "Pages with entries",
    "Rhymes:Esperanto/ula"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "nulo",
        "3": "-a",
        "t1": "zero"
      },
      "expansion": "nulo (“zero”) + -a",
      "name": "af"
    }
  ],
  "etymology_text": "From nulo (“zero”) + -a.",
  "forms": [
    {
      "form": "nulan",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "nulaj",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "nulajn",
      "tags": [
        "accusative",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "nula (accusative singular nulan, plural nulaj, accusative plural nulajn)",
      "name": "eo-head"
    }
  ],
  "hyphenation": [
    "nu‧la"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "adj",
  "senses": [
    {
      "glosses": [
        "without value, nonexistent"
      ],
      "links": [
        [
          "nonexistent",
          "nonexistent"
        ]
      ]
    },
    {
      "categories": [
        "eo:Mathematics"
      ],
      "glosses": [
        "equal to zero (of angles and mathematical functions)"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "zero",
          "zero"
        ],
        [
          "angle",
          "angle"
        ],
        [
          "function",
          "function"
        ]
      ],
      "raw_glosses": [
        "(mathematics) equal to zero (of angles and mathematical functions)"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    },
    {
      "categories": [
        "Esperanto ordinal numbers"
      ],
      "glosses": [
        "zeroth"
      ],
      "links": [
        [
          "ordinal number",
          "ordinal number"
        ],
        [
          "zeroth",
          "zeroth"
        ]
      ],
      "raw_glosses": [
        "(ordinal number) zeroth"
      ],
      "tags": [
        "numeral",
        "ordinal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈnula]"
    },
    {
      "rhymes": "-ula"
    }
  ],
  "word": "nula"
}