"-dem" meaning in Latin

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  "etymology_text": "Etymology tree\nProto-Indo-European *-éad\nProto-Italic *-ōd\nLatin -ōder.\nLatin -em\nLatin -dem\nMisinterpretation 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).",
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          "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”)"
        }
      ],
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        "demonstrative ending"
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        "(unproductive) demonstrative ending"
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      "ipa": "[dẽː]",
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    {
      "ipa": "[dem]",
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  "etymology_text": "Etymology tree\nProto-Indo-European *-éad\nProto-Italic *-ōd\nLatin -ōder.\nLatin -em\nLatin -dem\nMisinterpretation 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).",
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          "text": "ita (“in this way”) > itidem (“likewise”)"
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        {
          "text": "quī (“whereby”) > quidem (“indeed”)"
        },
        {
          "text": "is (“he, it”) > īdem (“the same”)"
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          "text": "tam (“to such an extent”) > tandem (“finally”)"
        },
        {
          "text": "tantus (“of much size”) > tantusdem (“just as much”)"
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          "text": "pri (\"before\") > prīdem (“long ago; previously”)"
        }
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