Fourth Declension (Declinatio Quarta)

The circumflex accent ( ) is used to denote the length of the vowels.


Fourth declension includes nouns of all the threee genders, the sthem of which ends with u. For this reason it is called also u- declension.
 
Cases
Singular
 
Plural
m
f
n
m
f
n
Nom.
Gen.
Dat.
Acc.
Abl.
Voc.
fructus
fructus
fructui
fructum
fructu
fructus
manus
manus
manui
manum
manu
manus
genu
genus
genu
genu
genu
genu
fructus
fructuum
fructibus
fructus
fructibus
fructus
manu
manuum
manibus
manus
manibus
manus
genua
genuum
genibus
genua
genibus
genua

Between the most important words of fourth declension are:

acus, us mf needle, pin
arcus, us mf bow, ark
cornu, us n horn, wing of army
domus, us f home, house, fatherland
fructus, us m fruit
gelu, us n frost, ice, snow
genu, us n knee
Jesus, us m Jesus
manus, us f hand
metus, us mf fear, anxiety
motus, us m motion
porticus, us f portico, colonnade
spiritus, us m spirit
tribus, us f third part of the people, tribe


Particularities

The name Jesus has only three declensional forms in singular:
nom. Jesus, gen./dat./abl./voc. Jesu, acc. Jesum.

The noun domus, us f has some doublet forms on the pattern of 2nd declension:
 

Cases
Singular
Plural
Nom.
Gen.
Dat.
Acc.
Abl.
Voc.
domus
domus, domi
domui, domo
domum
domo, domu
domus
domus
domorum, domuum
domibus
domos, domus
domibus
domus


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