Latin Nouns of the First Declension - Endings

Please note: Latin Declension Rules

The ending on first declension nouns is characterized by an "a." With many Latin adjectives, there are three forms, e.g., unus, una, unum (one). The one with the nominative in "a" -- una -- is feminine, as are most of the nouns in the first declension. However, there are also common first declension nouns that are masculine.

The endings of the first declension are
singular
nominative -a
genitive -ae
dative -ae
accusative -am
ablative -a

plural
nominative -ae
genitive -arum
dative -is
accusative -as
ablative -is

The vocative is the same as the nominative.
The locative singular ends in -ae.
The ablative singular a-ending has a macron or long mark on it when the font permits. The dative and ablative singular (which are the same) also have a long mark on the vowel. The dative, ablative, and locative plural are the same. The "a" in the genitive and accusative plural also has a long mark.

Example porta, -ae, f. gate

singular

nom. - porta

gen. - portae

dat. - portae

acc. - portam

abl. -porta

plural

nom. - portae

gen. -portarum

dat. - portis

acc. - portas

abl. - portis