The Fifth Declension.
Genitive singular -ē̆ī, genitive plural -ē-rum.
[596]. Stems in -ē- are substantive only, and feminine.
[597]. diēs, day, is always masculine in the plural, and commonly in the singular; but the feminine is common when diēs denotes length of time or a set day. merīdiēs, midday, is masculine and singular only.
[598]. The nominative of stems in -ē- ends, including the stem vowel, in -ē-s.
[599]. Stems in -ē- are of two classes:
[600]. (1.) Stems of the first class have one or two syllables; there are four of them: rēs, thing, spēs, hope, diēs, day, and fidēs, faith.
Of this class, rēs and diēs have a plural throughout; spēs has only the nominative and accusative plural, and fidēs has no plural.
[601]. Stems in -ē- of the first class are declined as follows:
| Examples Stems | rēs, thing, rē-, F. | diēs, day, diē-, M. | Stem and case endings |
|---|---|---|---|
| Singular | |||
| Nom. | rēs, a (or the) thing | diēs | -es |
| Gen. | rĕ̄i, re͡i, a thing’s, of a thing | diēī, die͡i | -ē̆ī, -ēī, -e͡i |
| Dat. | rĕ̄i, re͡i, to or for a thing | diēī, die͡i | -ē̆ī, -ēī, -e͡i |
| Acc. | rem, a thing | diem | -em |
| Abl. | rē, from, with, or by a thing | diē | -ē |
| Plural | |||
| Nom. | rēs, (the) things | diēs | -ēs |
| Gen. | rērum, things’, of things | diērum | -ērum |
| Dat. | rēbus, to or for things | diēbus | -ēbus |
| Acc. | rēs, things | diēs | -ēs |
| Abl. | rēbus, from, with, or by things | diēbus | -ēbus |