"click reaction" meaning in English

{
  "forms": [
    {
      "form": "click reactions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "click reaction (plural click reactions)",
      "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": "Chemical reactions",
          "orig": "en:Chemical reactions",
          "parents": [
            "Chemistry",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A reaction in click chemistry."
      ],
      "id": "en-click_reaction-en-noun-On5eZ5LT",
      "links": [
        [
          "click chemistry",
          "click chemistry"
        ]
      ]
    }
  ],
  "word": "click reaction"
}

{
  "forms": [
    {
      "form": "click reactions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "click reaction (plural click reactions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
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        "English nouns",
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      ],
      "glosses": [
        "A reaction in click chemistry."
      ],
      "links": [
        [
          "click chemistry",
          "click chemistry"
        ]
      ]
    }
  ],
  "word": "click reaction"
}