"derailment" meaning in English

{
  "categories": [
    {
      "kind": "other",
      "name": "Terms suffixed with -ment",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "derail",
        "2": "ment"
      },
      "expansion": "derail + -ment",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "derail + -ment",
  "forms": [
    {
      "form": "derailment",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "derailments",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "text": "Investigators are searching for the cause of the derailment that injured three."
        }
      ],
      "glosses": [
        "Derailment is the action of a train leaving the rails along which it runs."
      ],
      "id": "simple-derailment-en-noun-fpWmHaLp",
      "raw_tags": [
        "countable & uncountable"
      ]
    }
  ],
  "word": "derailment"
}

{
  "categories": [
    "Terms suffixed with -ment"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "derail",
        "2": "ment"
      },
      "expansion": "derail + -ment",
      "name": "ety-suffix"
    }
  ],
  "etymology_text": "derail + -ment",
  "forms": [
    {
      "form": "derailment",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "derailments",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Countable nouns",
        "Uncountable nouns"
      ],
      "examples": [
        {
          "text": "Investigators are searching for the cause of the derailment that injured three."
        }
      ],
      "glosses": [
        "Derailment is the action of a train leaving the rails along which it runs."
      ],
      "raw_tags": [
        "countable & uncountable"
      ]
    }
  ],
  "word": "derailment"
}