"pro quo" meaning in Ido

{
  "etymology_templates": [
    {
      "args": {
        "1": "io",
        "2": "fr",
        "3": "pourquoi"
      },
      "expansion": "Calque of French pourquoi",
      "name": "calque"
    },
    {
      "args": {
        "1": "io",
        "2": "it",
        "3": "perché",
        "notext": "1"
      },
      "expansion": "Italian perché",
      "name": "calque"
    },
    {
      "args": {
        "1": "io",
        "2": "es",
        "3": "por qué",
        "notext": "1"
      },
      "expansion": "Spanish por qué",
      "name": "calque"
    }
  ],
  "etymology_text": "From Calque of French pourquoi, Italian perché, Spanish por qué.",
  "forms": [
    {
      "form": "pro qui",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "adverb",
        "3": "plural",
        "4": "pro qui",
        "cat2": "correlatives",
        "cat3": "interrogative adverbs"
      },
      "expansion": "pro quo (plural pro qui)",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ido correlatives",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ido entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Why is the sky blue? (direct question)",
          "text": "Pro quo esas la cielo blua?",
          "type": "example"
        },
        {
          "english": "You helped me because why? (indirect question)",
          "text": "Vu helpis me pro quo?",
          "type": "example"
        }
      ],
      "glosses": [
        "why, for what reason"
      ],
      "id": "en-pro_quo-io-adv-w5eWo5-~",
      "links": [
        [
          "why",
          "why"
        ]
      ],
      "raw_glosses": [
        "(interrogative adverb) why, for what reason"
      ],
      "related": [
        {
          "english": "who (person)",
          "word": "qua"
        },
        {
          "english": "what (thing)",
          "word": "quo"
        },
        {
          "english": "who (plural)",
          "word": "qui"
        },
        {
          "english": "where",
          "word": "ube"
        },
        {
          "english": "when",
          "word": "kande"
        },
        {
          "english": "how",
          "sense": "quala (“what kind of”)",
          "word": "quale"
        },
        {
          "english": "quantity",
          "sense": "quanta (“how much”)",
          "word": "quanto"
        }
      ],
      "tags": [
        "adverb",
        "interrogative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pro kwo/"
    },
    {
      "ipa": "/pɾɔ kwɔ/"
    }
  ],
  "word": "pro quo"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "io",
        "2": "fr",
        "3": "pourquoi"
      },
      "expansion": "Calque of French pourquoi",
      "name": "calque"
    },
    {
      "args": {
        "1": "io",
        "2": "it",
        "3": "perché",
        "notext": "1"
      },
      "expansion": "Italian perché",
      "name": "calque"
    },
    {
      "args": {
        "1": "io",
        "2": "es",
        "3": "por qué",
        "notext": "1"
      },
      "expansion": "Spanish por qué",
      "name": "calque"
    }
  ],
  "etymology_text": "From Calque of French pourquoi, Italian perché, Spanish por qué.",
  "forms": [
    {
      "form": "pro qui",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "adverb",
        "3": "plural",
        "4": "pro qui",
        "cat2": "correlatives",
        "cat3": "interrogative adverbs"
      },
      "expansion": "pro quo (plural pro qui)",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "adv",
  "related": [
    {
      "english": "who (person)",
      "word": "qua"
    },
    {
      "english": "what (thing)",
      "word": "quo"
    },
    {
      "english": "who (plural)",
      "word": "qui"
    },
    {
      "english": "where",
      "word": "ube"
    },
    {
      "english": "when",
      "word": "kande"
    },
    {
      "english": "how",
      "sense": "quala (“what kind of”)",
      "word": "quale"
    },
    {
      "english": "quantity",
      "sense": "quanta (“how much”)",
      "word": "quanto"
    }
  ],
  "senses": [
    {
      "categories": [
        "Ido adverbs",
        "Ido correlatives",
        "Ido entries with incorrect language header",
        "Ido interrogative adverbs",
        "Ido lemmas",
        "Ido multiword terms",
        "Ido terms calqued from French",
        "Ido terms calqued from Italian",
        "Ido terms calqued from Spanish",
        "Ido terms derived from French",
        "Ido terms derived from Italian",
        "Ido terms derived from Spanish",
        "Ido terms with IPA pronunciation",
        "Ido terms with usage examples"
      ],
      "examples": [
        {
          "english": "Why is the sky blue? (direct question)",
          "text": "Pro quo esas la cielo blua?",
          "type": "example"
        },
        {
          "english": "You helped me because why? (indirect question)",
          "text": "Vu helpis me pro quo?",
          "type": "example"
        }
      ],
      "glosses": [
        "why, for what reason"
      ],
      "links": [
        [
          "why",
          "why"
        ]
      ],
      "raw_glosses": [
        "(interrogative adverb) why, for what reason"
      ],
      "tags": [
        "adverb",
        "interrogative"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pro kwo/"
    },
    {
      "ipa": "/pɾɔ kwɔ/"
    }
  ],
  "word": "pro quo"
}