"уай" meaning in Russian

{
  "forms": [
    {
      "form": "уа́й",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "uáj",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "уа́й",
        "2": "n-in",
        "3": "-"
      },
      "expansion": "уа́й • (uáj) n inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ru",
          "name": "Letter names",
          "orig": "ru:Letter names",
          "parents": [
            "Letters, symbols, and punctuation",
            "Names",
            "Orthography",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Writing",
            "Fundamental",
            "Nouns",
            "Human behaviour",
            "Language",
            "Lemmas",
            "Human",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Y, y"
      ],
      "id": "en-уай-ru-noun-aycoAMtv",
      "links": [
        [
          "Y",
          "Y"
        ],
        [
          "y",
          "y"
        ]
      ],
      "raw_glosses": [
        "(English letter) Y, y"
      ],
      "tags": [
        "English",
        "indeclinable",
        "letter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʊˈaj]"
    }
  ],
  "word": "уай"
}

{
  "forms": [
    {
      "form": "уа́й",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "uáj",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "уа́й",
        "2": "n-in",
        "3": "-"
      },
      "expansion": "уа́й • (uáj) n inan (indeclinable)",
      "name": "ru-noun"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Russian 2-syllable words",
        "Russian entries with incorrect language header",
        "Russian inanimate nouns",
        "Russian indeclinable nouns",
        "Russian lemmas",
        "Russian neuter nouns",
        "Russian nouns",
        "Russian terms with IPA pronunciation",
        "ru:Letter names"
      ],
      "glosses": [
        "Y, y"
      ],
      "links": [
        [
          "Y",
          "Y"
        ],
        [
          "y",
          "y"
        ]
      ],
      "raw_glosses": [
        "(English letter) Y, y"
      ],
      "tags": [
        "English",
        "indeclinable",
        "letter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʊˈaj]"
    }
  ],
  "word": "уай"
}