"'rithmetic" meaning in English

{
  "etymology_text": "A shortened form of arithmetic, especially an aphetic form used to stress and compare its initial \"r\" sound to that of the words \"reading\" and \"writing\".",
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      "expansion": "'rithmetic",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "arithmetic"
        }
      ],
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      "glosses": [
        "Abbreviation of arithmetic."
      ],
      "id": "en-'rithmetic-en-noun-Ph7~JSIY",
      "links": [
        [
          "arithmetic",
          "arithmetic#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
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  ],
  "word": "'rithmetic"
}

{
  "etymology_text": "A shortened form of arithmetic, especially an aphetic form used to stress and compare its initial \"r\" sound to that of the words \"reading\" and \"writing\".",
  "head_templates": [
    {
      "args": {
        "1": "en",
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      "expansion": "'rithmetic",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "arithmetic"
        }
      ],
      "categories": [
        "English abbreviations",
        "English aphetic forms",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English nouns",
        "English terms with redundant sortkeys",
        "Pages with raw sortkeys"
      ],
      "glosses": [
        "Abbreviation of arithmetic."
      ],
      "links": [
        [
          "arithmetic",
          "arithmetic#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "'rithmetic"
}