"null recurrence" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "null",
        "3": "recurrence"
      },
      "expansion": "null + recurrence",
      "name": "compound"
    }
  ],
  "etymology_text": "null + recurrence",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "null recurrence (uncountable)",
      "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": "Hebrew terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The quality of being null recurrent."
      ],
      "id": "en-null_recurrence-en-noun-emYUmmER",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "null recurrent",
          "null recurrent"
        ]
      ],
      "qualifier": "stochastic processes",
      "raw_glosses": [
        "(mathematics, stochastic processes) The quality of being null recurrent."
      ],
      "related": [
        {
          "word": "positive recurrence"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "he",
          "lang": "Hebrew",
          "roman": "nishnút éfes",
          "sense": "the quality of being null recurrent",
          "tags": [
            "feminine"
          ],
          "word": "נשנות אפס"
        }
      ]
    }
  ],
  "word": "null recurrence"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "null",
        "3": "recurrence"
      },
      "expansion": "null + recurrence",
      "name": "compound"
    }
  ],
  "etymology_text": "null + recurrence",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "null recurrence (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "positive recurrence"
    }
  ],
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Hebrew terms with redundant script codes",
        "en:Mathematics"
      ],
      "glosses": [
        "The quality of being null recurrent."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "null recurrent",
          "null recurrent"
        ]
      ],
      "qualifier": "stochastic processes",
      "raw_glosses": [
        "(mathematics, stochastic processes) The quality of being null recurrent."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "nishnút éfes",
      "sense": "the quality of being null recurrent",
      "tags": [
        "feminine"
      ],
      "word": "נשנות אפס"
    }
  ],
  "word": "null recurrence"
}