"-dem" meaning in Latin

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "-em"
      },
      "expansion": "-em",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "is"
      },
      "expansion": "is",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "totidem"
      },
      "expansion": "totidem",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "tantumdem"
      },
      "expansion": "tantumdem",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "ibīdem"
      },
      "expansion": "ibīdem",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "tamen",
        "3": "tam-en"
      },
      "expansion": "tam-en",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "tandem",
        "3": "tan-dem"
      },
      "expansion": "tan-dem",
      "name": "m"
    }
  ],
  "etymology_text": "Misinterpretation of -em. When the old ablative cases of is, eōd, eād, became eō, eā, the true forms eōd-em, eād-em were interpreted as eō-dem, eā-dem. The neuter nominative singular id-em is natural and gives earlier emem (= later eundem). The new marker -dem then served to create totidem, tantumdem, ibīdem, etc. Compare tam-en with its later doublet: tan-dem (← *tam-dem).",
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "ibī (“in that place”) > ibidem (“in that very place”)"
        },
        {
          "text": "ita (“in this way”) > itidem (“likewise”)"
        },
        {
          "text": "quī (“whereby”) > quidem (“indeed”)"
        },
        {
          "text": "is (“he, it”) > īdem (“the same”)"
        },
        {
          "text": "tam (“to such an extent”) > tandem (“finally”)"
        },
        {
          "text": "tantus (“of much size”) > tantusdem (“just as much”)"
        },
        {
          "text": "pri (\"before\") > prīdem (“long ago; previously”)"
        }
      ],
      "glosses": [
        "demonstrative ending"
      ],
      "id": "en--dem-la-suffix-XNTPSroy",
      "qualifier": "unproductive",
      "raw_glosses": [
        "(unproductive) demonstrative ending"
      ],
      "tags": [
        "morpheme",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/dem/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[d̪ɛ̃ˑ]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/dem/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[d̪em]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "-dem"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "la",
        "2": "-em"
      },
      "expansion": "-em",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "is"
      },
      "expansion": "is",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "totidem"
      },
      "expansion": "totidem",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "tantumdem"
      },
      "expansion": "tantumdem",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "ibīdem"
      },
      "expansion": "ibīdem",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "tamen",
        "3": "tam-en"
      },
      "expansion": "tam-en",
      "name": "m"
    },
    {
      "args": {
        "1": "la",
        "2": "tandem",
        "3": "tan-dem"
      },
      "expansion": "tan-dem",
      "name": "m"
    }
  ],
  "etymology_text": "Misinterpretation of -em. When the old ablative cases of is, eōd, eād, became eō, eā, the true forms eōd-em, eād-em were interpreted as eō-dem, eā-dem. The neuter nominative singular id-em is natural and gives earlier emem (= later eundem). The new marker -dem then served to create totidem, tantumdem, ibīdem, etc. Compare tam-en with its later doublet: tan-dem (← *tam-dem).",
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Latin 1-syllable words",
        "Latin adverb-forming suffixes",
        "Latin entries with incorrect language header",
        "Latin lemmas",
        "Latin suffixes",
        "Latin terms with IPA pronunciation",
        "Latin uncomparable adverbs"
      ],
      "examples": [
        {
          "text": "ibī (“in that place”) > ibidem (“in that very place”)"
        },
        {
          "text": "ita (“in this way”) > itidem (“likewise”)"
        },
        {
          "text": "quī (“whereby”) > quidem (“indeed”)"
        },
        {
          "text": "is (“he, it”) > īdem (“the same”)"
        },
        {
          "text": "tam (“to such an extent”) > tandem (“finally”)"
        },
        {
          "text": "tantus (“of much size”) > tantusdem (“just as much”)"
        },
        {
          "text": "pri (\"before\") > prīdem (“long ago; previously”)"
        }
      ],
      "glosses": [
        "demonstrative ending"
      ],
      "qualifier": "unproductive",
      "raw_glosses": [
        "(unproductive) demonstrative ending"
      ],
      "tags": [
        "morpheme",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/dem/",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "[d̪ɛ̃ˑ]",
      "tags": [
        "Classical"
      ]
    },
    {
      "ipa": "/dem/",
      "note": "modern Italianate Ecclesiastical"
    },
    {
      "ipa": "[d̪em]",
      "note": "modern Italianate Ecclesiastical"
    }
  ],
  "word": "-dem"
}