"quadtone" meaning in English

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  "etymology_text": "quad- + tone",
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      "glosses": [
        "An interval of four whole tones."
      ],
      "id": "en-quadtone-en-noun-r2W-LUIf",
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      "raw_glosses": [
        "(music) An interval of four whole tones."
      ],
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        "entertainment",
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        "music"
      ]
    },
    {
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      "examples": [
        {
          "ref": "1995, Adele Droblas Greenberg, Seth Greenberg, “Converting from One Mode to Another”, in Fundamental Photoshop, 2nd edition, Osborne McGraw-Hill, page 380",
          "text": "In Photoshop’s Duotone mode you can create monotones, duotones, tritones, and quadtones—grayscale images to which you add one, two, three, or four colors.",
          "type": "quotation"
        },
        {
          "ref": "2003, Duncan Evans, “Duotones and Tritones”, in A Comprehensive Guide to Digital Portrait Photography, AVA Publishing SA, page 115",
          "text": "When using tritones or quadtones (in which three colours are blended together) all the secondary colours are mixed together.",
          "type": "quotation"
        },
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          "ref": "2010, David Präkel, “Duotone”, in The Visual Dictionary of Photography, AVA Publishing SA, page 97",
          "text": "The two colours need not be black and grey; computer duotones can be created from a greyscale original in any two colours; tritones use three inks and quadtones four.",
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        }
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        "A picture printed in four shades."
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  "word": "quadtone"
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        "An interval of four whole tones."
      ],
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        ],
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        "(music) An interval of four whole tones."
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        "music"
      ]
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        },
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