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Used almost exclusively in footnotes of academic or scholarly papers, especially those of the legal profession, to indicate that the source or author referred to in a footnote is the same as in the preceding footnote; usually abbreviated when so used.
When is' ablative cases eōd, eād became eō, eā, idem's ablative 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).
“ Eadem mē ad fāta vocāssēs: īdem ambās ferrō dolor, atque eadem hōra tulisset.”
“You should have called me to the same fate: Both of us could have been taken by the sword – the same pain, and at the same hour.” (Anna speaks to her dying sister, Dido.)
Declension
Irregular declension. Similar to the declension of is, ea, id.
Demonstrative pronoun (with m optionally → n in compounds) with an indeclinable portion.
1The nom./dat./abl. plural forms regularly developed into a monosyllable /iː(s)/, with later remodelling - compare the etymology of deus. This /iː/ was normally spelled as EI during and as II after the Republic; a disyllabic iī, spelled II, Iꟾ, appears in Silver Age poetry, while disyllabic eīs is only post-Classical. Other spellings include EEI(S), EIEI(S), IEI(S). 2The dat. singular is found spelled EIEI (here represented as ēī) and scanned as two longs in Plautus, but also as a monosyllable. The latter is its normal scansion in Classical. Other spellings include EEI, IEI.
^ De Vaan, Michiel (2008) “-dem”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 166