"improvisation" meaning in English

{
  "forms": [
    {
      "form": "improvisation",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "improvisations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "examples": [
        {
          "text": "Tom and Jerry's 'improvisation at the party was a success."
        },
        {
          "text": "Tom and Jerry's 'improvisations at parties are always successes."
        }
      ],
      "glosses": [
        "Improvisation refers to a performance without a script, plan, direction, or rehearsal."
      ],
      "id": "simple-improvisation-en-noun-ClqhQuRo"
    },
    {
      "glosses": [
        "Making something better, improving it to make something better."
      ],
      "id": "simple-improvisation-en-noun-rf9759DG"
    }
  ],
  "sounds": [
    {
      "ipa": "/ɪmprəvaɪˈzeɪʃən/",
      "tags": [
        "UK"
      ]
    },
    {
      "ipa": "/ɪmˌprɑvəˈzeɪʃən/",
      "tags": [
        "US"
      ]
    },
    {
      "audio": "LL-Q1860 (eng)-Vealhurl-improvisation.wav",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "improvisation"
}

{
  "forms": [
    {
      "form": "improvisation",
      "tags": [
        "singular"
      ]
    },
    {
      "form": "improvisations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "expansion": "[POS TABLE]",
      "name": "noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "examples": [
        {
          "text": "Tom and Jerry's 'improvisation at the party was a success."
        },
        {
          "text": "Tom and Jerry's 'improvisations at parties are always successes."
        }
      ],
      "glosses": [
        "Improvisation refers to a performance without a script, plan, direction, or rehearsal."
      ]
    },
    {
      "glosses": [
        "Making something better, improving it to make something better."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɪmprəvaɪˈzeɪʃən/",
      "tags": [
        "UK"
      ]
    },
    {
      "ipa": "/ɪmˌprɑvəˈzeɪʃən/",
      "tags": [
        "US"
      ]
    },
    {
      "audio": "LL-Q1860 (eng)-Vealhurl-improvisation.wav",
      "raw_tags": [
        "Audio"
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "improvisation"
}