"madainn mhath" meaning in Scottish Gaelic

{
  "head_templates": [
    {
      "args": {
        "1": "gd",
        "2": "interjection",
        "head": "madainn mhath"
      },
      "expansion": "madainn mhath",
      "name": "head"
    }
  ],
  "lang": "Scottish Gaelic",
  "lang_code": "gd",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Scottish Gaelic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Scottish Gaelic entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Scottish Gaelic phrasebook",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "good morning, greetings, hello"
      ],
      "id": "en-madainn_mhath-gd-intj-JyHXy6zr",
      "links": [
        [
          "good morning",
          "good morning"
        ],
        [
          "greetings",
          "greetings"
        ],
        [
          "hello",
          "hello"
        ]
      ],
      "related": [
        {
          "word": "latha math"
        },
        {
          "word": "feasgar math"
        },
        {
          "word": "oidhche mhath"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mat̪əɲ ˈva/"
    },
    {
      "ipa": "/mat̪əɲ ˈvɛ/",
      "note": "Argyll"
    }
  ],
  "word": "madainn mhath"
}

{
  "head_templates": [
    {
      "args": {
        "1": "gd",
        "2": "interjection",
        "head": "madainn mhath"
      },
      "expansion": "madainn mhath",
      "name": "head"
    }
  ],
  "lang": "Scottish Gaelic",
  "lang_code": "gd",
  "pos": "intj",
  "related": [
    {
      "word": "latha math"
    },
    {
      "word": "feasgar math"
    },
    {
      "word": "oidhche mhath"
    }
  ],
  "senses": [
    {
      "categories": [
        "Scottish Gaelic entries with incorrect language header",
        "Scottish Gaelic entries with language name categories using raw markup",
        "Scottish Gaelic interjections",
        "Scottish Gaelic lemmas",
        "Scottish Gaelic multiword terms",
        "Scottish Gaelic phrasebook",
        "Scottish Gaelic terms with IPA pronunciation"
      ],
      "glosses": [
        "good morning, greetings, hello"
      ],
      "links": [
        [
          "good morning",
          "good morning"
        ],
        [
          "greetings",
          "greetings"
        ],
        [
          "hello",
          "hello"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/mat̪əɲ ˈva/"
    },
    {
      "ipa": "/mat̪əɲ ˈvɛ/",
      "note": "Argyll"
    }
  ],
  "word": "madainn mhath"
}