"harmonic proportion" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "The relation of three quantities in harmonic progression, with the second being a harmonic mean between the first and third, as in the three numbers 2, 3, and 6."
      ],
      "id": "en-harmonic_proportion-en-noun-xTCOZW5S",
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          "mathematics",
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        [
          "relation",
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        ],
        [
          "harmonic progression",
          "harmonic progression"
        ],
        [
          "harmonic mean",
          "harmonic mean"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The relation of three quantities in harmonic progression, with the second being a harmonic mean between the first and third, as in the three numbers 2, 3, and 6."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "harmonic proportion"
}

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    {
      "form": "harmonic proportions",
      "tags": [
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "The relation of three quantities in harmonic progression, with the second being a harmonic mean between the first and third, as in the three numbers 2, 3, and 6."
      ],
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          "mathematics",
          "mathematics"
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        [
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          "relation"
        ],
        [
          "harmonic progression",
          "harmonic progression"
        ],
        [
          "harmonic mean",
          "harmonic mean"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The relation of three quantities in harmonic progression, with the second being a harmonic mean between the first and third, as in the three numbers 2, 3, and 6."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "harmonic proportion"
}