Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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FIFTH DECLENSION (ē-STEMS)

[*] 95. The Stem of nouns of the Fifth Declension ends in ē-, which appears in all the cases. The Nominative is formed from the stem by adding s.

[*] 96. Nouns of the Fifth Declension are declined as follows:—

rēs , F., thing	diēs, M., day	fidēs, F., faith
STEM rē-	STEM diē-	STEM fidē-

[*] Note.--The ē of the stem is shortened in the genitive and dative singular of fidēs, spēs , rēs , but in these it is found long in early Latin. In the accusative singular e is always short.

		SINGULAR
				CASE-ENDINGS
NOM.	rēs	diēs	fidēs	-ēs
GEN.	rĕī	diēī (di ē ）	fidĕī	-ēī (-ē）
DAT.	rĕī	diēī (di ē ）	fidĕī	-ēī (-ē）
ACC.	rem	diem	fidem	-em
ABL.	rē	diē	fidē	-ē
		PLURAL
NOM.	rēs	diēs		-ēs
GEN.	rērum	diērum		-ērum
DAT.	rēbus	diēbus		-ēbus
ACC.	rēs	diēs		ēs
ABL.	rēbus	diēbus		-ēbus

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Gender in the Fifth Declension

[*] 97. All nouns of the Fifth Declension are Feminine, except diēs (usually M.), day, and merīdiēs (M.), noon.

[*] a. Diēs is sometimes feminine in the singular, especially in phrases indicating a fixed time, and regularly feminine when used of time in general: as, cōnstitūtā diē, on a set day; longa diēs, a long time.

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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 -ē. 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 plēbei , tribune of the people ( plēbēs ). Genitives in -ī and -ē 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 -ī is cited.