"step function" meaning in English

{
  "forms": [
    {
      "form": "step functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "step function (plural step functions)",
      "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"
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Functions",
          "orig": "en:Functions",
          "parents": [
            "Algebra",
            "Calculus",
            "Geometry",
            "Mathematical analysis",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A function from the real line to a finite subset of the real line."
      ],
      "id": "en-step_function-en-noun-dolcKjFi",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "function",
          "function"
        ],
        [
          "real line",
          "real line"
        ],
        [
          "finite",
          "finite"
        ],
        [
          "subset",
          "subset"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A function from the real line to a finite subset of the real line."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "mathematical function",
          "word": "askelfunktio"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "mathematical function",
          "word": "lépcsős függvény"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "mathematical function",
          "tags": [
            "common-gender"
          ],
          "word": "stegfunktion"
        }
      ],
      "wikipedia": [
        "step function"
      ]
    }
  ],
  "word": "step function"
}

{
  "forms": [
    {
      "form": "step functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "step function (plural step functions)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English multiword terms",
        "English nouns",
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        "en:Functions",
        "en:Mathematics"
      ],
      "glosses": [
        "A function from the real line to a finite subset of the real line."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "function",
          "function"
        ],
        [
          "real line",
          "real line"
        ],
        [
          "finite",
          "finite"
        ],
        [
          "subset",
          "subset"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A function from the real line to a finite subset of the real line."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "step function"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "mathematical function",
      "word": "askelfunktio"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "mathematical function",
      "word": "lépcsős függvény"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "mathematical function",
      "tags": [
        "common-gender"
      ],
      "word": "stegfunktion"
    }
  ],
  "word": "step function"
}