a. Of nouns of the fifth declension, only diés and rés are declined throughout. Most want the plural, which is, however, found in the nominative or accusative in aciés, effigiés, éluviés, faciés, glaciés, seriés, speciés, spés.[The forms faciérum, speciérum, speciébus, spérum, spébus, are cited by grammarians, also spérés, spéribus, and some of these occur in late authors.]
b. The Locative form of this declension ends in -é. It is found only in certain adverbs and expressions of time: -
|hodié, to-day;||dié quártó (old, quártí), the fourth day;|
|perendié, day after to-morrow;||prídié, the day before.|
c. The fifth declension is closely related to the first, and several noun have forms of both: as, máteria, -iés; saevitia, -iés. The genitive and dative in -éí are rarely found in these words.
d. Some nouns vary between the fifth and the third declension: as, requiés, satiés (also satiás, genitive -átis), plébés (also plébs, genitive plébis) famés, genitive famis, ablative famé.
NOTE: In the genitive and dative -éí (-eí) was sometimes contracted into -ei as, tribúnus plébei, tribune of the people (plébés). Genitives in -í and -é also occur as, dií (Aen. i. 636), plébí-scítum, acié (B. G. ii. 23). A few examples of the old genitive in -és are found (cf. -ás in the first declension, § 43. b). The dative has rarely -é and a form in -í is cited.