"c.f." meaning in English

{
  "forms": [
    {
      "form": "c.f.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "c.f."
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      "expansion": "c.f. (plural c.f.)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "cantus firmus"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Abbreviation of cantus firmus."
      ],
      "id": "en-c.f.-en-noun-ySYvDC-V",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "cantus firmus",
          "cantus firmus#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of cantus firmus."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "c.f."
}

{
  "head_templates": [
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      "expansion": "c.f.",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "cf."
        }
      ],
      "categories": [],
      "glosses": [
        "Misspelling of cf.."
      ],
      "id": "en-c.f.-en-verb-FEWo6OAz",
      "links": [
        [
          "cf.",
          "cf.#English"
        ]
      ],
      "tags": [
        "alt-of",
        "misspelling"
      ]
    }
  ],
  "word": "c.f."
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English indeclinable nouns",
    "English lemmas",
    "English misspellings",
    "English non-lemma forms",
    "English nouns",
    "English nouns with irregular plurals",
    "English terms spelled with .",
    "English words without vowels",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "c.f.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "c.f."
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      "expansion": "c.f. (plural c.f.)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "cantus firmus"
        }
      ],
      "categories": [
        "English abbreviations",
        "en:Music"
      ],
      "glosses": [
        "Abbreviation of cantus firmus."
      ],
      "links": [
        [
          "music",
          "music"
        ],
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          "cantus firmus",
          "cantus firmus#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of cantus firmus."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "c.f."
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English indeclinable nouns",
    "English lemmas",
    "English misspellings",
    "English non-lemma forms",
    "English nouns",
    "English nouns with irregular plurals",
    "English terms spelled with .",
    "English words without vowels",
    "Pages with 1 entry",
    "Pages with entries"
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  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "cf."
        }
      ],
      "categories": [
        "English misspellings"
      ],
      "glosses": [
        "Misspelling of cf.."
      ],
      "links": [
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          "cf.",
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        ]
      ],
      "tags": [
        "alt-of",
        "misspelling"
      ]
    }
  ],
  "word": "c.f."
}