出典:Wiktionary
出典:『Wiktionary』 (2026/01/15 02:04 UTC 版)
From Proto-Italic *izdim; equivalent to is (“he”) + Proto-Italic *-im (emphatic marker) (whence Sabellic *-om, Oscan 𐌝𐌔𐌝𐌃𐌖𐌌 (ísídum), 𐌄𐌔𐌝𐌃𐌖𐌌 (esídum)), from Proto-Indo-European *im (whence also Old Latin im, em), accusative singular of *éy (so both parts are from the same source). The s was lost and the i lengthened by compensatory lengthening.
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. De verborum significatione gives emem as a form of the later eundem.[1] The new marker -dem then served to create totidem, tantundem, ibīdem, etc. Compare tam-en with its later doublet: tan-dem (← *tam-dem).
īdem (feminine eadem, neuter idem); demonstrative pronoun (with m optionally → n in compounds) with an indeclinable portion
Irregular declension. Similar to the declension of is, ea, id. Demonstrative pronoun (with m optionally → n in compounds) with an indeclinable portion.
| singular | plural | ||||||
|---|---|---|---|---|---|---|---|
| masculine | feminine | neuter | masculine | feminine | neuter | ||
| nominative | īdem | eadem | idem | iīdem eīdem īdem |
eaedem | eadem | |
| genitive | eiusdem ejusdem |
eōrundem eōrumdem eundem eumdem |
eārundem eārumdem |
eōrundem eōrumdem eundem eumdem |
|||
| dative | eīdem e͡idem ēīdem |
eīdem e͡idem ēīdem eaedem |
eīdem e͡idem ēīdem |
iīsdem eīsdem īsdem |
iīsdem eīsdem īsdem eābusdem |
iīsdem eīsdem īsdem |
|
| accusative | eundem eumdem |
eandem eamdem |
idem | eōsdem | eāsdem | eadem | |
| ablative | eōdem | eādem | eōdem | iīsdem eīsdem īsdem |
|||
| vocative | — | — | |||||
The 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).
The 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.