"rall." meaning in English

{
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      "args": {
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      },
      "expansion": "rall. (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "rallentando"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of rallentando."
      ],
      "id": "en-rall.-en-adj-Jr5gx9EJ",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "rallentando",
          "rallentando#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of rallentando."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "not-comparable"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "rall."
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "rall. (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "rallentando"
        }
      ],
      "categories": [
        "English abbreviations",
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms spelled with .",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Music"
      ],
      "glosses": [
        "Abbreviation of rallentando."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "rallentando",
          "rallentando#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of rallentando."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "not-comparable"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "rall."
}