"RCSA" meaning in All languages combined

{
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    {
      "form": "RCSAs",
      "tags": [
        "plural"
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      "expansion": "RCSA (plural RCSAs)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "residual chemical shift anisotropy"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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        {
          "kind": "other",
          "name": "English links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nuclear physics",
          "orig": "en:Nuclear physics",
          "parents": [
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            "Quantum mechanics",
            "Sciences",
            "All topics",
            "Fundamental"
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      "glosses": [
        "Initialism of residual chemical shift anisotropy"
      ],
      "id": "en-RCSA-en-noun-sk-O49Ui",
      "links": [
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          "nuclear physics"
        ],
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          "residual chemical shift anisotropy",
          "w:residual chemical shift anisotropy"
        ]
      ],
      "qualifier": "nuclear physics",
      "raw_glosses": [
        "(nuclear physics) Initialism of residual chemical shift anisotropy"
      ],
      "tags": [
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        "alt-of",
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    }
  ],
  "word": "RCSA"
}

{
  "forms": [
    {
      "form": "RCSAs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "RCSA (plural RCSAs)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "residual chemical shift anisotropy"
        }
      ],
      "categories": [
        "English countable nouns",
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        "English links with redundant alt parameters",
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        "English nouns",
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      "glosses": [
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          "nuclear physics"
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          "w:residual chemical shift anisotropy"
        ]
      ],
      "qualifier": "nuclear physics",
      "raw_glosses": [
        "(nuclear physics) Initialism of residual chemical shift anisotropy"
      ],
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        "initialism"
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  "word": "RCSA"
}