"convulsion" meaning in English

{
  "forms": [
    {
      "form": "convulsion",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "convulsions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "examples": [
        {
          "text": "ow, my arm is having a convulsion! It's so tense and I can't relax it!"
        }
      ],
      "glosses": [
        "A convulsion is when someone's muscles contract very hard without the person wanting it."
      ],
      "id": "simple-convulsion-en-noun-GHN3P2ss"
    },
    {
      "examples": [
        {
          "text": "earthquakes can cause convulsions because they are so terrifying."
        }
      ],
      "glosses": [
        "A convulsion is when there is a lot of turmoil--if nobody knows what is happening and people are afraid it is a convulsion."
      ],
      "id": "simple-convulsion-en-noun-CUV3SJEN"
    }
  ],
  "sounds": [
    {
      "ipa": "/kənˈvʌlʃən/"
    }
  ],
  "word": "convulsion"
}

{
  "forms": [
    {
      "form": "convulsion",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "convulsions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "examples": [
        {
          "text": "ow, my arm is having a convulsion! It's so tense and I can't relax it!"
        }
      ],
      "glosses": [
        "A convulsion is when someone's muscles contract very hard without the person wanting it."
      ]
    },
    {
      "examples": [
        {
          "text": "earthquakes can cause convulsions because they are so terrifying."
        }
      ],
      "glosses": [
        "A convulsion is when there is a lot of turmoil--if nobody knows what is happening and people are afraid it is a convulsion."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kənˈvʌlʃən/"
    }
  ],
  "word": "convulsion"
}