"Err." meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "Err.",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "errors"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "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": "Law",
          "orig": "en:Law",
          "parents": [
            "Justice",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of errors."
      ],
      "id": "en-Err.-en-noun-Uh034JJ4",
      "links": [
        [
          "law",
          "law#English"
        ],
        [
          "errors",
          "errors#English"
        ]
      ],
      "raw_glosses": [
        "(law) Abbreviation of errors."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "law"
      ]
    }
  ],
  "word": "Err."
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "Err.",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "errors"
        }
      ],
      "categories": [
        "English abbreviations",
        "English case citation abbreviations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms spelled with .",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Law"
      ],
      "glosses": [
        "Abbreviation of errors."
      ],
      "links": [
        [
          "law",
          "law#English"
        ],
        [
          "errors",
          "errors#English"
        ]
      ],
      "raw_glosses": [
        "(law) Abbreviation of errors."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "law"
      ]
    }
  ],
  "word": "Err."
}