A. Nouns of the fifth declension have their genitive in eī and the nominative in ēs. The fifth declension differs but slightly from the third, and is a mere modification of it. Diēs, m. & f., the day, rēs, f., a thing, and speciēs, f., the appearance, are thus inflected:—
So decline aciēs, f., the edge or point; faciēs, f., the face; effigiēs, f., the image, effigy; merīdiēs, m., midday, noon; spēs, f., hope; seriēs, f., the series.
Remark.—The e of the ablative of the fifth declension is always long.
B. Obs. Nouns of this declension are feminine, with the exception of diēs, which in the singular is generally masculine and sometimes feminine,2 but in the plural always masculine. Its compound, merīdiēs, is masculine, and used in the singular only.
1 The e of the genitive and dative is long when a vowel precedes, but short after a consonant, e.g. aciēī, faciēī, &c., but speī, reī, fideī, &c. 2 It is feminine when it denotes, 1) duration of time, e.g. diem perexiguam, integram, (for) a very short day, an entire day; 2) an appointed day, e.g. certā (cōnstitūtā, dictā, &c.) diē, on the appointed day. 3 The Ancients having no term for such an instrument, it must be expressed by circumlocution. On the dative embolīs extrahendīs, "for extracting corks," compare Lesson XXV., Obs.—The same remark applies to mūnimentum capitis pluviāle (where pluviāle is an adjective in e), to mūnimentum digitī, and to a host of other names of modern objects. In all the cases, we can only approximate by description. 4 The word umbrāculum (from umbra, shade) was used by the Ancients in the sense of our "parasol." 5 The expressions vērē or rēctē loquor and errō have reference to language or opinions simply; whereas fās and nefās involve the moral distinction of right and wrong in action or in speech. The latter phrases are often followed by an infinitive, as, Estne mihi fās (or licetne mihi) hoc facere? Is it right for me to do so? Am I right in doing so? Illud dīcēre tibi nefās est, It is wrong for you to say so, You are wrong in saying so. Fās and nefās are both indeclinable, like nihil. 6Immo vērō corresponds to the English "nay, rather," "nay, on the contrary."