"rarification" meaning in English

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      "expansion": "rarification (countable and uncountable, plural rarifications)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "alt_of": [
        {
          "word": "rarefaction"
        }
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      "examples": [
        {
          "ref": "1872, The American Journal of Science:",
          "text": "As soon as the manometer of the pump indicated the maximum of rarification, the apparatus was inclined […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of rarefaction"
      ],
      "id": "en-rarification-en-noun-E-k6OvTI",
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          "rarefaction",
          "rarefaction#English"
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      "tags": [
        "alt-of",
        "alternative",
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  "word": "rarification"
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{
  "forms": [
    {
      "form": "rarifications",
      "tags": [
        "plural"
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    }
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  "head_templates": [
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      "expansion": "rarification (countable and uncountable, plural rarifications)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "rarefaction"
        }
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          "ref": "1872, The American Journal of Science:",
          "text": "As soon as the manometer of the pump indicated the maximum of rarification, the apparatus was inclined […]",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of rarefaction"
      ],
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          "rarefaction#English"
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  "word": "rarification"
}