First declension (Declinatio Prima)

The circumflex accent ( ) is used to denote the length of the vowels.
 
 
The nouns the stem of which is ended by -a are ascribed to the first declension (it is often called merely a- declension). Generally, these nouns are feminines, like:
 
aqua water
femina woman
forma form
mensa table
rosa rose
terra earth

There are, however, some masculine nouns, like nauta m sailor, agricola m farmer etc., while some others, like incola mf inhabitant are both masculine and feminine.

See the exhaustive List of Masculine nouns in the First declension.
 
 

Declension of rosa and nauta
 
Case
Singular
Plural
f
m
f
m
Nom.
Gen.
Dat.
Acc.
Abl.
Voc.
rosa
rosae
rosae
rosam
rosâ
rosa
nauta
nautae
nautae
nautam
nautâ
nauta
rosae
rosârum
rosis
rosas
rosis
rosae
nautae
nautârum
nautis
nautas
nautis
nautae
 
 
Particularities
 
The nouns dea f godess, filia f daughter and liberta f freedwoman have doublet forms - deâbus, filiâbus and libertâbus - for Dat. and Abl. pl. These forms are older and were preserved to be made a distinction from the corresponding forms of the 2nd declension masculines deus m god, filius m son and libertus m freedman, cf.:
deis deâbusque to the gods and to the  godesses,
filiis et filiâbus to the sons and to the daughters.
The noun familia family has preserved its older genitive sg. form familias in the expressions:
pater familias father of family   and    mater familias mother of family.
The compound nouns with -cola and -gena have doublet forms for gen. pl. ending by -um, cf.:
agricolum and agricolârum.

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