"cation exchange" meaning in English

{
  "forms": [
    {
      "form": "cation exchanges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "cation exchange (plural cation exchanges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Inorganic chemistry",
          "orig": "en:Inorganic chemistry",
          "parents": [
            "Chemistry",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The normal form of ion exchange in which cations such as those of calcium are removed from solution"
      ],
      "id": "en-cation_exchange-en-noun-xPgSg9d1",
      "links": [
        [
          "inorganic chemistry",
          "inorganic chemistry"
        ],
        [
          "ion exchange",
          "ion exchange"
        ],
        [
          "cation",
          "cation"
        ],
        [
          "calcium",
          "calcium"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry) The normal form of ion exchange in which cations such as those of calcium are removed from solution"
      ],
      "topics": [
        "chemistry",
        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "masculine"
          ],
          "word": "Kationenaustausch"
        }
      ]
    }
  ],
  "word": "cation exchange"
}

{
  "forms": [
    {
      "form": "cation exchanges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "cation exchange (plural cation exchanges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Translation table header lacks gloss",
        "en:Inorganic chemistry"
      ],
      "glosses": [
        "The normal form of ion exchange in which cations such as those of calcium are removed from solution"
      ],
      "links": [
        [
          "inorganic chemistry",
          "inorganic chemistry"
        ],
        [
          "ion exchange",
          "ion exchange"
        ],
        [
          "cation",
          "cation"
        ],
        [
          "calcium",
          "calcium"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry) The normal form of ion exchange in which cations such as those of calcium are removed from solution"
      ],
      "topics": [
        "chemistry",
        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "masculine"
      ],
      "word": "Kationenaustausch"
    }
  ],
  "word": "cation exchange"
}