1. Noun Review: Fourth & Fifth Declensions
Magister Henderson
Latin II

2. About the Last Two Declensions
Latin has only five declensions.
The fourth declension, sometimes called the u-declension, is mostly masculine, but also contains a number of neuter nouns.
The fifth declension, sometimes called the e-declension, is almost all feminine, except for two masculine nouns.
These two nouns are diēs (day) and its compound form meridiēs (noon).

3. The Fourth Declension
Singular
Plural
Nominative
-us
-ūs
spiritus
spiritūs
Genitive
-uum
spirituum
Dative
-uī
-ibus
spirituī
spiritibus
Accusative
-um
spiritum
Ablative -ū
spiritū
The fourth declension resembles the second declension in the nominative and accusative singular. Pay attention to the genitive singular to avoid confusion.
The few feminine nouns in the fourth declension use the same endings as the masculine nouns.

4. Nouns in the Fourth Declension
arcus, arcūs m. = bow, arch
domus, domūs f. = home
exercitus, exercitūs m. = army
manus, manūs f. = hand
portus, portūs m. = harbor
passus, passūs m. = step
sensus, sensūs m. = feeling
situs, sitūs m. = position

5. The Fifth Declension
Singular
Plural
Nominative
-ēs
speciēs
Genitive
-eī
-ērum
specieī
speciērum
Dative
-ēbus
speciēbus
Accusative
-em
speciem
Ablative -e
specie
The fifth declension resembles the third declension in the accusative and ablative singular and the nominative and accusative plural. Pay attention to the genitive singular to avoid confusion.
The few masculine nouns in the fifth declension use the same endings as the feminine nouns.

6. Nouns in the Fifth Declension
aciēs, acieī f. = edge
diēs, dieī m. = day
faciēs, facieį f. = face
fidēs, fideī f. = faith
glaciēs, glacieī f. = ice
meridiēs, meridieī m. = noon
seriēs, serieī f. = row
spēs, speī f. = hope