"relative dating" meaning in English

{
  "forms": [
    {
      "form": "relative datings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "relative dating (plural relative datings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock."
      ],
      "id": "en-relative_dating-en-noun-GOWQQtpF",
      "links": [
        [
          "age",
          "age"
        ],
        [
          "fossil",
          "fossil"
        ]
      ],
      "raw_glosses": [
        "(uncountable) A method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock."
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "An act of so doing."
      ],
      "id": "en-relative_dating-en-noun-EmfXmAB-",
      "raw_glosses": [
        "(countable) An act of so doing."
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "word": "relative dating"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "relative datings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "relative dating (plural relative datings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English uncountable nouns"
      ],
      "glosses": [
        "A method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock."
      ],
      "links": [
        [
          "age",
          "age"
        ],
        [
          "fossil",
          "fossil"
        ]
      ],
      "raw_glosses": [
        "(uncountable) A method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock."
      ],
      "tags": [
        "uncountable"
      ]
    },
    {
      "categories": [
        "English countable nouns"
      ],
      "glosses": [
        "An act of so doing."
      ],
      "raw_glosses": [
        "(countable) An act of so doing."
      ],
      "tags": [
        "countable"
      ]
    }
  ],
  "word": "relative dating"
}