"ground truth" meaning in English

{
  "forms": [
    {
      "form": "ground truths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "ground truth (countable and uncountable, plural ground truths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "derived": [
        {
          "word": "ground truthing"
        }
      ],
      "glosses": [
        "Information acquired by direct observation rather than by inference."
      ],
      "id": "en-ground_truth-en-noun-DqUBYJF8",
      "links": [
        [
          "Information",
          "information"
        ],
        [
          "direct",
          "direct"
        ],
        [
          "observation",
          "observation"
        ],
        [
          "inference",
          "inference"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "information acquired by direct observation",
          "word": "地面實況"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "dìmiàn shíkuàng",
          "sense": "information acquired by direct observation",
          "word": "地面实况"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "information acquired by direct observation",
          "tags": [
            "plural"
          ],
          "word": "havainnot"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "information acquired by direct observation",
          "tags": [
            "feminine"
          ],
          "word": "vérité terrain"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "information acquired by direct observation",
          "tags": [
            "masculine"
          ],
          "word": "Vor-Ort-Messwert"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "information acquired by direct observation",
          "tags": [
            "masculine"
          ],
          "word": "Feldvergleich"
        }
      ]
    }
  ],
  "wikipedia": [
    "ground truth"
  ],
  "word": "ground truth"
}

{
  "forms": [
    {
      "form": "ground truths",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "ground truthing",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "ground truthed",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "ground truthed",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ground truth (third-person singular simple present ground truths, present participle ground truthing, simple past and past participle ground truthed)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "_dis": "28 72",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "To gather information by direct observation rather than inference."
      ],
      "id": "en-ground_truth-en-verb-Py9n7DKZ",
      "related": [
        {
          "word": "field-test"
        },
        {
          "word": "on the ground"
        },
        {
          "word": "facts on the ground"
        }
      ]
    }
  ],
  "wikipedia": [
    "ground truth"
  ],
  "word": "ground truth"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English uncountable nouns",
    "English verbs"
  ],
  "derived": [
    {
      "word": "ground truthing"
    }
  ],
  "forms": [
    {
      "form": "ground truths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "ground truth (countable and uncountable, plural ground truths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "Information acquired by direct observation rather than by inference."
      ],
      "links": [
        [
          "Information",
          "information"
        ],
        [
          "direct",
          "direct"
        ],
        [
          "observation",
          "observation"
        ],
        [
          "inference",
          "inference"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "information acquired by direct observation",
      "word": "地面實況"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "dìmiàn shíkuàng",
      "sense": "information acquired by direct observation",
      "word": "地面实况"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "information acquired by direct observation",
      "tags": [
        "plural"
      ],
      "word": "havainnot"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "information acquired by direct observation",
      "tags": [
        "feminine"
      ],
      "word": "vérité terrain"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "information acquired by direct observation",
      "tags": [
        "masculine"
      ],
      "word": "Vor-Ort-Messwert"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "information acquired by direct observation",
      "tags": [
        "masculine"
      ],
      "word": "Feldvergleich"
    }
  ],
  "wikipedia": [
    "ground truth"
  ],
  "word": "ground truth"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English uncountable nouns",
    "English verbs"
  ],
  "forms": [
    {
      "form": "ground truths",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "ground truthing",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "ground truthed",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "ground truthed",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ground truth (third-person singular simple present ground truths, present participle ground truthing, simple past and past participle ground truthed)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "field-test"
    },
    {
      "word": "on the ground"
    },
    {
      "word": "facts on the ground"
    }
  ],
  "senses": [
    {
      "glosses": [
        "To gather information by direct observation rather than inference."
      ]
    }
  ],
  "wikipedia": [
    "ground truth"
  ],
  "word": "ground truth"
}