"io" meaning in Latin

{
  "etymology_text": "Echoic; compare Greek ἰώ (iṓ), or English yo.",
  "forms": [
    {
      "form": "iō",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "intj",
        "head": "iō"
      },
      "expansion": "iō",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "44 7 50",
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "an exclamation of joy: hurray, hurrah, yay"
      ],
      "id": "en-io-la-intj-f24T8aS4",
      "links": [
        [
          "joy",
          "joy#English"
        ],
        [
          "hurray",
          "hurray"
        ],
        [
          "hurrah",
          "hurrah"
        ],
        [
          "yay",
          "yay"
        ]
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "english": "(See Persephone. The full context implies a cry of anguish as well as a plea for help from Persephone's mother, Ceres. The alternative ‘‘Help!’’ calls for an imperative such as ‘‘ferte auxilium!’’.)",
          "ref": "8 CE, Ovid, Fasti 4.447–448",
          "text": "illa quidem clāmābat ‘iō, cārissima māter, auferor!’\nIndeed, she was crying out, “Oh! mother dearest – I am being taken away!”"
        }
      ],
      "glosses": [
        "an exclamation of pain: oh, ah, alas"
      ],
      "id": "en-io-la-intj-bLMyKwYW",
      "links": [
        [
          "pain",
          "pain#English"
        ],
        [
          "oh",
          "oh"
        ],
        [
          "ah",
          "ah"
        ],
        [
          "alas",
          "alas"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "44 7 50",
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "an exclamation for getting attention: hey, oi, look, quick"
      ],
      "id": "en-io-la-intj-O6UbWxNH",
      "links": [
        [
          "attention",
          "attention#English"
        ],
        [
          "hey",
          "hey"
        ],
        [
          "oi",
          "oi"
        ],
        [
          "look",
          "look"
        ],
        [
          "quick",
          "quick"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈi.oː/",
      "tags": [
        "Classical-Latin"
      ]
    },
    {
      "ipa": "[ˈioː]",
      "tags": [
        "Classical-Latin"
      ]
    },
    {
      "ipa": "/ˈi.o/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[ˈiːo]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "io"
}

{
  "categories": [
    "Latin 2-syllable words",
    "Latin entries with incorrect language header",
    "Latin interjections",
    "Latin lemmas",
    "Latin terms with IPA pronunciation",
    "Pages with 20 entries",
    "Pages with entries"
  ],
  "etymology_text": "Echoic; compare Greek ἰώ (iṓ), or English yo.",
  "forms": [
    {
      "form": "iō",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "intj",
        "head": "iō"
      },
      "expansion": "iō",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "intj",
  "senses": [
    {
      "glosses": [
        "an exclamation of joy: hurray, hurrah, yay"
      ],
      "links": [
        [
          "joy",
          "joy#English"
        ],
        [
          "hurray",
          "hurray"
        ],
        [
          "hurrah",
          "hurrah"
        ],
        [
          "yay",
          "yay"
        ]
      ]
    },
    {
      "categories": [
        "Latin terms with quotations"
      ],
      "examples": [
        {
          "english": "(See Persephone. The full context implies a cry of anguish as well as a plea for help from Persephone's mother, Ceres. The alternative ‘‘Help!’’ calls for an imperative such as ‘‘ferte auxilium!’’.)",
          "ref": "8 CE, Ovid, Fasti 4.447–448",
          "text": "illa quidem clāmābat ‘iō, cārissima māter, auferor!’\nIndeed, she was crying out, “Oh! mother dearest – I am being taken away!”"
        }
      ],
      "glosses": [
        "an exclamation of pain: oh, ah, alas"
      ],
      "links": [
        [
          "pain",
          "pain#English"
        ],
        [
          "oh",
          "oh"
        ],
        [
          "ah",
          "ah"
        ],
        [
          "alas",
          "alas"
        ]
      ]
    },
    {
      "glosses": [
        "an exclamation for getting attention: hey, oi, look, quick"
      ],
      "links": [
        [
          "attention",
          "attention#English"
        ],
        [
          "hey",
          "hey"
        ],
        [
          "oi",
          "oi"
        ],
        [
          "look",
          "look"
        ],
        [
          "quick",
          "quick"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈi.oː/",
      "tags": [
        "Classical-Latin"
      ]
    },
    {
      "ipa": "[ˈioː]",
      "tags": [
        "Classical-Latin"
      ]
    },
    {
      "ipa": "/ˈi.o/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[ˈiːo]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "io"
}