"overestimation" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "over",
        "3": "estimation"
      },
      "expansion": "over- + estimation",
      "name": "prefix"
    }
  ],
  "etymology_text": "over- + estimation",
  "forms": [
    {
      "form": "overestimations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "overestimation (countable and uncountable, plural overestimations)",
      "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": "other",
          "name": "English terms prefixed with over-",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An excessive estimation."
      ],
      "id": "en-overestimation-en-noun-tgAEkPH2",
      "links": [
        [
          "estimation",
          "estimation"
        ]
      ],
      "related": [
        {
          "word": "overestimate"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "el",
          "lang": "Greek",
          "roman": "yperektímisi",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "υπερεκτίμηση"
        },
        {
          "alt": "かだいひょうか",
          "code": "ja",
          "lang": "Japanese",
          "roman": "kadai-hyōka",
          "sense": "Translations",
          "word": "過大評価"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "Translations",
          "tags": [
            "common-gender"
          ],
          "word": "överskattning"
        }
      ]
    }
  ],
  "word": "overestimation"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "over",
        "3": "estimation"
      },
      "expansion": "over- + estimation",
      "name": "prefix"
    }
  ],
  "etymology_text": "over- + estimation",
  "forms": [
    {
      "form": "overestimations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "overestimation (countable and uncountable, plural overestimations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "overestimate"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with over-",
        "English uncountable nouns",
        "Translation table header lacks gloss"
      ],
      "glosses": [
        "An excessive estimation."
      ],
      "links": [
        [
          "estimation",
          "estimation"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "roman": "yperektímisi",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "υπερεκτίμηση"
    },
    {
      "alt": "かだいひょうか",
      "code": "ja",
      "lang": "Japanese",
      "roman": "kadai-hyōka",
      "sense": "Translations",
      "word": "過大評価"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "Translations",
      "tags": [
        "common-gender"
      ],
      "word": "överskattning"
    }
  ],
  "word": "overestimation"
}