"unit function" meaning in English

{
  "forms": [
    {
      "form": "unit functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "unit function (plural unit functions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Functions",
          "orig": "en:Functions",
          "parents": [
            "Algebra",
            "Calculus",
            "Geometry",
            "Mathematical analysis",
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          "name": "Mathematics",
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          "parents": [
            "Formal sciences",
            "Sciences",
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            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise:",
        "a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise"
      ],
      "hypernyms": [
        {
          "word": "multiplicative function"
        }
      ],
      "hyponyms": [
        {
          "word": "Heaviside unit function"
        }
      ],
      "id": "en-unit_function-en-noun-KOLtx4wi",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "multiplicative function",
          "multiplicative function"
        ]
      ],
      "raw_glosses": [
        "(mathematics) a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise:"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "unit function"
}

{
  "forms": [
    {
      "form": "unit functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "unit function (plural unit functions)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "word": "multiplicative function"
    }
  ],
  "hyponyms": [
    {
      "word": "Heaviside unit function"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Functions",
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      "glosses": [
        "a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise:",
        "a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "multiplicative function",
          "multiplicative function"
        ]
      ],
      "raw_glosses": [
        "(mathematics) a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise:"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "unit function"
}