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Allen and Greenough/ New Latin Grammar

Case-Forms in the Fifth Declension

98. The following peculiarities require notice:—

a. Of nouns of the fifth declension, only diēs and rēs are declined throughout. Most want the plural, which is, however, found in the nominative or accusative in aciēs, effigiēs, ēluviēs, faciēs, glaciēs, seriēs, speciēs, spēs. 1

b. The Locative form of this declension ends in . It is found only in certain adverbs and expressions of time:—

hodiē, to-day;diē quārtō (old, quārtī), the fourth day;
perendiē, day after to-morrow;prīdiē, the day before.

c.The fifth declension is closely related to the first, and several nouns have forms of both: as, māteria, -iēs ; saevitia, -iēs . The genitive and dative in -ēī are rarely found in these words.

d. Some nouns vary between the fifth and the third declension: as, requiēs, satiēs (also satiās, genitive -ātis, plēbēs (also plēbs, genitive plēbis), famēs, genitive famis, ablative famē.

Note In the genitive and dative -ēī ( -ĕī ) was sometimes contracted into - ei : as, tribūnus plēb ei, tribune of the people ( plēbēs ). Genitives in and also occur: as, diī (Aen. 1.636), plēbī-scītum, aciē (B. G. 2.23). A few examples of the old genitive in -ēs are found (cf. -ās in the first declension, § 43 . b). The dative has rarely -ē, and a form in is cited.

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Notes
1
The forms faciērum , speciērum , speciēbus , spērum , spēbus , are cited by grammarians, also spērēs , spēribus , and some of these occur in late authors.