"null recurrent" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "null",
        "3": "recurrent"
      },
      "expansion": "null + recurrent",
      "name": "compound"
    }
  ],
  "etymology_text": "null + recurrent",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "null recurrent (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "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": [
        "Recurrent with infinite expected return time."
      ],
      "id": "en-null_recurrent-en-adj-a8z1C-Oi",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "state",
          "state"
        ],
        [
          "Recurrent",
          "recurrent"
        ],
        [
          "infinite",
          "infinite"
        ]
      ],
      "qualifier": "stochastic processes",
      "raw_glosses": [
        "(mathematics, stochastic processes, of a state) Recurrent with infinite expected return time."
      ],
      "raw_tags": [
        "of a state"
      ],
      "synonyms": [
        {
          "sense": "math",
          "word": "null persistent"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "he",
          "lang": "Hebrew",
          "roman": "nishné éfes",
          "sense": "recurrent with finite expected return time",
          "word": "נשנה אפס"
        }
      ],
      "wikipedia": [
        "Markov_chain#Recurrence"
      ]
    }
  ],
  "word": "null recurrent"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "null",
        "3": "recurrent"
      },
      "expansion": "null + recurrent",
      "name": "compound"
    }
  ],
  "etymology_text": "null + recurrent",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "null recurrent (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English compound terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English uncomparable adjectives",
        "Hebrew terms with redundant script codes",
        "en:Mathematics"
      ],
      "glosses": [
        "Recurrent with infinite expected return time."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "state",
          "state"
        ],
        [
          "Recurrent",
          "recurrent"
        ],
        [
          "infinite",
          "infinite"
        ]
      ],
      "qualifier": "stochastic processes",
      "raw_glosses": [
        "(mathematics, stochastic processes, of a state) Recurrent with infinite expected return time."
      ],
      "raw_tags": [
        "of a state"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Markov_chain#Recurrence"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "math",
      "word": "null persistent"
    }
  ],
  "translations": [
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "nishné éfes",
      "sense": "recurrent with finite expected return time",
      "word": "נשנה אפס"
    }
  ],
  "word": "null recurrent"
}