"principal photography" meaning in English

{
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      "expansion": "principal photography (uncountable)",
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  "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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          "parents": [
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cinematography",
          "orig": "en:Cinematography",
          "parents": [
            "Film",
            "Entertainment",
            "Mass media",
            "Culture",
            "Media",
            "Society",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The phase of film production during which the film is actually shot, as distinct from pre-production and post-production."
      ],
      "id": "en-principal_photography-en-noun-RflnvsEM",
      "links": [
        [
          "cinematography",
          "cinematography"
        ],
        [
          "pre-production",
          "pre-production"
        ],
        [
          "post-production",
          "post-production"
        ]
      ],
      "raw_glosses": [
        "(cinematography) The phase of film production during which the film is actually shot, as distinct from pre-production and post-production."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "broadcasting",
        "cinematography",
        "film",
        "media",
        "television"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "phase of film production during which the film is actually shot",
          "word": "主體拍攝"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "zhǔtǐ pāishè",
          "sense": "phase of film production during which the film is actually shot",
          "word": "主体拍摄"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "phase of film production during which the film is actually shot",
          "word": "主体拍攝"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "phase of film production during which the film is actually shot",
          "tags": [
            "plural"
          ],
          "word": "kuvaukset"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "phase of film production during which the film is actually shot",
          "tags": [
            "plural"
          ],
          "word": "pääkuvaukset"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "phase of film production during which the film is actually shot",
          "tags": [
            "masculine"
          ],
          "word": "tournage principal"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "phase of film production during which the film is actually shot",
          "tags": [
            "feminine",
            "plural"
          ],
          "word": "Dreharbeiten"
        }
      ],
      "wikipedia": [
        "principal photography"
      ]
    }
  ],
  "word": "principal photography"
}

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      "args": {
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      "expansion": "principal photography (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
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        "en:Cinematography"
      ],
      "glosses": [
        "The phase of film production during which the film is actually shot, as distinct from pre-production and post-production."
      ],
      "links": [
        [
          "cinematography",
          "cinematography"
        ],
        [
          "pre-production",
          "pre-production"
        ],
        [
          "post-production",
          "post-production"
        ]
      ],
      "raw_glosses": [
        "(cinematography) The phase of film production during which the film is actually shot, as distinct from pre-production and post-production."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "broadcasting",
        "cinematography",
        "film",
        "media",
        "television"
      ],
      "wikipedia": [
        "principal photography"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "phase of film production during which the film is actually shot",
      "word": "主體拍攝"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "zhǔtǐ pāishè",
      "sense": "phase of film production during which the film is actually shot",
      "word": "主体拍摄"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "phase of film production during which the film is actually shot",
      "word": "主体拍攝"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "zhǔtǐ pāishè",
      "sense": "phase of film production during which the film is actually shot",
      "word": "主体拍摄"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "phase of film production during which the film is actually shot",
      "tags": [
        "plural"
      ],
      "word": "kuvaukset"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "phase of film production during which the film is actually shot",
      "tags": [
        "plural"
      ],
      "word": "pääkuvaukset"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "phase of film production during which the film is actually shot",
      "tags": [
        "masculine"
      ],
      "word": "tournage principal"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "phase of film production during which the film is actually shot",
      "tags": [
        "feminine",
        "plural"
      ],
      "word": "Dreharbeiten"
    }
  ],
  "word": "principal photography"
}