"funzione circolare" meaning in Italian

{
  "forms": [
    {
      "form": "funzioni circolari",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "funzione circolare f (plural funzioni circolari)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "it",
          "name": "Trigonometry",
          "orig": "it:Trigonometry",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "circular function"
      ],
      "id": "en-funzione_circolare-it-noun-XfLC5tVM",
      "links": [
        [
          "trigonometry",
          "trigonometry"
        ],
        [
          "circular function",
          "circular function"
        ]
      ],
      "raw_glosses": [
        "(trigonometry) circular function"
      ],
      "synonyms": [
        {
          "word": "funzione trigonometrica"
        }
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "trigonometry"
      ],
      "wikipedia": [
        "it:funzione circolare"
      ]
    }
  ],
  "word": "funzione circolare"
}

{
  "forms": [
    {
      "form": "funzioni circolari",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "funzione circolare f (plural funzioni circolari)",
      "name": "it-noun"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Italian countable nouns",
        "Italian entries with incorrect language header",
        "Italian feminine nouns",
        "Italian lemmas",
        "Italian multiword terms",
        "Italian nouns",
        "it:Trigonometry"
      ],
      "glosses": [
        "circular function"
      ],
      "links": [
        [
          "trigonometry",
          "trigonometry"
        ],
        [
          "circular function",
          "circular function"
        ]
      ],
      "raw_glosses": [
        "(trigonometry) circular function"
      ],
      "synonyms": [
        {
          "word": "funzione trigonometrica"
        }
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "mathematics",
        "sciences",
        "trigonometry"
      ],
      "wikipedia": [
        "it:funzione circolare"
      ]
    }
  ],
  "word": "funzione circolare"
}