"deltiology" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "δελτίον"
      },
      "expansion": "Ancient Greek δελτίον (deltíon)",
      "name": "uder"
    },
    {
      "args": {
        "1": "grc",
        "2": "δέλτος"
      },
      "expansion": "δέλτος (déltos)",
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      "args": {
        "1": "en",
        "2": "-logy"
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      "expansion": "English -logy",
      "name": "cog"
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  ],
  "etymology_text": "Formed by suffixing the Ancient Greek δελτίον (deltíon) (deltion; the diminutive form of δέλτος (déltos), deltos, “writing tablet”) with the English -logy.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "deltiology (uncountable)",
      "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",
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          "kind": "other",
          "name": "Khmer terms with redundant script codes",
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            "Terms with redundant script codes",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with raw sortkeys",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Deltiology",
          "orig": "en:Deltiology",
          "parents": [
            "Hobbies",
            "Recreation",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "deltiologist"
        }
      ],
      "glosses": [
        "The study and collection of postcards."
      ],
      "hypernyms": [
        {
          "sense": "study and collection of postcards",
          "word": "collection"
        }
      ],
      "id": "en-deltiology-en-noun--1T5hXet",
      "links": [
        [
          "collection",
          "collection"
        ],
        [
          "postcard",
          "postcard"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "study and collection of postcards",
          "word": "postikorttien keräily"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "study and collection of postcards",
          "tags": [
            "feminine"
          ],
          "word": "deltiologie"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "study and collection of postcards",
          "tags": [
            "feminine"
          ],
          "word": "Philokartie"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "study and collection of postcards",
          "word": "képeslapgyűjtemény"
        },
        {
          "code": "km",
          "lang": "Khmer",
          "roman": "bann pray sa’nii vityie",
          "sense": "study and collection of postcards",
          "word": "បណ្ណប្រៃសនីយវិទ្យា"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "filokartija",
          "sense": "study and collection of postcards",
          "word": "филокартия"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌdɛltɪˈɒlədʒɪ/",
      "tags": [
        "UK"
      ]
    },
    {
      "audio": "en-us-deltiology.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/05/En-us-deltiology.ogg/En-us-deltiology.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/0/05/En-us-deltiology.ogg",
      "tags": [
        "US"
      ],
      "text": "Audio (US)"
    },
    {
      "enpr": "dĕltĭŏʹləjĭ"
    }
  ],
  "word": "deltiology"
}

{
  "derived": [
    {
      "word": "deltiologist"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "δελτίον"
      },
      "expansion": "Ancient Greek δελτίον (deltíon)",
      "name": "uder"
    },
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      "args": {
        "1": "grc",
        "2": "δέλτος"
      },
      "expansion": "δέλτος (déltos)",
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        "1": "en",
        "2": "-logy"
      },
      "expansion": "English -logy",
      "name": "cog"
    }
  ],
  "etymology_text": "Formed by suffixing the Ancient Greek δελτίον (deltíon) (deltion; the diminutive form of δέλτος (déltos), deltos, “writing tablet”) with the English -logy.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "deltiology (uncountable)",
      "name": "en-noun"
    }
  ],
  "hypernyms": [
    {
      "sense": "study and collection of postcards",
      "word": "collection"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English 5-syllable words",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English nouns",
        "English terms derived from Ancient Greek",
        "English terms with IPA pronunciation",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "English undefined derivations",
        "Khmer terms with redundant script codes",
        "Pages with raw sortkeys",
        "en:Deltiology"
      ],
      "glosses": [
        "The study and collection of postcards."
      ],
      "links": [
        [
          "collection",
          "collection"
        ],
        [
          "postcard",
          "postcard"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌdɛltɪˈɒlədʒɪ/",
      "tags": [
        "UK"
      ]
    },
    {
      "audio": "en-us-deltiology.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/05/En-us-deltiology.ogg/En-us-deltiology.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/0/05/En-us-deltiology.ogg",
      "tags": [
        "US"
      ],
      "text": "Audio (US)"
    },
    {
      "enpr": "dĕltĭŏʹləjĭ"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "study and collection of postcards",
      "word": "postikorttien keräily"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "study and collection of postcards",
      "tags": [
        "feminine"
      ],
      "word": "deltiologie"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "study and collection of postcards",
      "tags": [
        "feminine"
      ],
      "word": "Philokartie"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "study and collection of postcards",
      "word": "képeslapgyűjtemény"
    },
    {
      "code": "km",
      "lang": "Khmer",
      "roman": "bann pray sa’nii vityie",
      "sense": "study and collection of postcards",
      "word": "បណ្ណប្រៃសនីយវិទ្យា"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "filokartija",
      "sense": "study and collection of postcards",
      "word": "филокартия"
    }
  ],
  "word": "deltiology"
}