For explanations of terms used in these grammar tables, check the
Glossary.
Edit Declension of Nouns
Edit 1st Declension Masculine/Feminine (each word has a set gender) puella
| 1st Declension | Singular | Plural |
|---|
| nominative | puell-a | puell-ae |
| genitive | puell-ae | puell-arum |
| dative | puell-ae | puell-is |
| accusative | puell-am | puell-as |
| ablative | puell-a | puell-is |
| vocative | puell-a | puell-ae |
Edit 2nd Declension Masculine/Feminine (each word has a set gender): servus
| 2nd Declension Masculine | Singular | Plural |
|---|
| nominative | serv-us | serv-i |
| genitive | serv-i | serv-orum |
| dative | serv-o | serv-is |
| accusative | serv-um | serv-os |
| ablative | serv-o | serv-is |
| vocative | serv-e | serv-i |
Edit 2nd Declension Neuter: bellum
| 2nd Declension Neuter | Singular |
|---|
| nominative | bell-um |
| accusative | bell-um |
| genitive | bell-i |
| dative | bell-o |
| ablative | bell-o |
| 2nd Declension Neuter | Plural |
|---|
| nominative | bell-a |
| accusative | bell-a |
| genitive | bell-orum |
| dative | bell-is |
| ablative | bell-is |
Edit 2nd Declension Masculine: puer
| 2nd Declension Masculine | Singular |
|---|
| nominative | puer |
| vocative | puer |
| accusative | puer-um |
| genitive | puer-i |
| dative | puer-o |
| ablative | puer-o |
| 2nd Declension Masculine | Plural |
|---|
| nominative | puer-i |
| accusative | puer-os |
| genitive | puer-orum |
| dative | puer-is |
| ablative | puer-is |
Edit 2nd Declension Masculine: ager
| 2nd Declension Masculine | Singular |
|---|
| nominative | ager |
| vocative | ager |
| accusative | agr-um |
| genitive | agr-i |
| dative | agr-o |
| ablative | agr-o |
| 2nd Declension | Plural |
|---|
| nominative | agr-i |
| accusative | agr-os |
| genitive | agr-orum |
| dative | agr-is |
| ablative | agr-is |
Edit 3rd Declension Masculine or Feminine (each word has a set gender): rex
| 3rd Declension | Singular |
|---|
| nominative | rex |
| vocative | rex |
| accusative | reg-em |
| genitive | reg-is |
| dative | reg-i |
| ablative | reg-e |
| 3rd Declension | Plural |
|---|
| nominative | reg-es |
| accusative | reg-es |
| genitive | reg-um |
| dative | reg-ibus |
| ablative | reg-ibus |
Edit 3rd Declension Neuter: mare
| 3rd Declension Neuter | Singular |
|---|
| nominative | mare |
| vocative | mare |
| accusative | mare |
| genitive | mar-is |
| dative | mar-i |
| ablative | mar-i |
| 3rd Declension | Plural |
|---|
| nominative | mar-ia |
| accusative | mar-ia |
| genitive | mar-ium |
| dative | mar-ibus |
| ablative | mar-ibus |
Edit 4th Declension Masculine/Feminine (each word has a set gender) gradus
| 4th Declension | Singular |
|---|
| nominative | grad-us |
| vocative | grad-us |
| accusative | grad-um |
| genitive | grad-us |
| dative | grad-ui |
| ablative | grad-u |
| 4th Declension | Plural |
|---|
| nominative | grad-us |
| accusative | grad-us |
| genitive | grad-uum |
| dative | grad-ibus |
| ablative | grad-ibus |
Edit 4th Declension Neuter: cornu
| 4th Declension Neuter | Singular |
|---|
| nominative | corn-u |
| vocative | corn-u |
| accusative | corn-u |
| genitive | corn-us |
| dative | corn-ui |
| ablative | corn-u |
| 4th Declension | Plural |
|---|
| nominative | corn-a |
| accusative | corn-a |
| genitive | corn-uum |
| dative | corn-ibus |
| ablative | corn-ibus |
Edit 5th Declension Masculine/Feminine (each word has a set gender): res
| 5th Declension Feminine/Masculine | Singular |
|---|
| nominative | r-es |
| vocative | r-es |
| accusative | r-em |
| genitive | r-ei |
| dative | r-ei |
| ablative | r-e |
| 5th Declension Masculine/Feminine | Plural |
|---|
| nominative | r-es |
| accusative | r-es |
| genitive | r-erum |
| dative | r-ebus |
| ablative | r-ebus |
m = masculine
f = feminine
n - neuter
Notes: 4/5th declensions are modified 3rd declensions, thus behave similarily. 3rd declension is either M/F/N, 4th declension is either M/F/N and 5th declension is either M/F. So for 3rd, 4th, and 5th declension is of most importance to memorise the gender because the adjective will still need to agree (ie have the same) with the noun in both case, gender, and number.
The Vocative only changes for the 2nd declension masculine singular (however not for the nouns that leave the -us suffix when in nominative).
There are a few exceptions in the 1st declension which are not feminine. Such nouns are poet-a (1st declension masculine, so to agree you need to use -us on the adjective) and naut-a.
There are a few second declension nouns with irregularities. It is of most importance that you memorise them.
When memorising a noun's meaning, make sure that you also memorise any irregularities the noun has, the gender, and the declension. Without doing this you may have trouble translating. For example, 2nd declension masculines have -us in the nominative singular; however, 4th declension masculines have -us in the nominative singular, nominative plural and accusative plural. This may get you confused if you do not memorise the declension of each noun.
EditSingle Declension Theory
If you look at the above list of declensions, you may feel that you are going to be overcome if you have to memorize all of it. Memorization is indeed the key, but it will be easier then you think. Each word in Latin has three parts: the root, the stem vowel, and the ending. There are five vowels in Latin, so there are five stem vowels: A,O,I,U,E. Any word not really having a stem vowel naturally was given to I. If you study the declension patterns enough you will see that there are many similarities in the declensions. All accusative singulars end in "m" except neuters that sometimes still do. All accusative plurals end in 's' except neuters that always end in
a. All genitive plurals end in "um", be it
ium, rum, uum or whatever else.
If you read enough Latin you will actually find that authors would switch a declension of a word at will if it made the sentence clearer. Thus many words that are of the 4th declension were sometimes written as if 2nd, and 5th declension as if 3rd and vice versa. Some ending patterns that we use for one declension may also be used in another, again to make the sentence clearer. Thus "filiabus" would be used in any sentence where we want to make it clear that we are talking about the Daughters and specifically not the Sons. We also see examples of this in
animabus. Some think that the
IS used in the first and second declensions was actually an abbreviation of
bus.
Some students find the ablative difficult since it sometimes looks like the nominative singular, dative plural or neither. All you really need to do to get the hang of this is to know that in the plural, the ablative always looks like the dative. If there is no prepostion in front of it then it is probably a dative, unless it is being used in an ablative construction that would likely be apparent. If there is a preposition and it looks like a dative, just remember that no preposition takes a dative, only ever ablative and sometimes accusative. Dative plural plus preposition equals ablative. The ablative singular is really just the root plus the stem vowel with no ending to speak of, since the preposition tells you the grammar of the word. Some students also get confused by words that are the same in the nominative singular and plural. Don't worry about that; the verb will tell you which it is since the verb always agrees with the nominative.
It is thought that originally there was only one declension, but during the task of applying it to every word in natural speech it was found that some words naturally changed the way the basic sounds of the original declension worked. Here is one idea of the original basic declension.
| Case | Root | Stem Vowel | Singular | Plural |
|---|
| nominative | puell | a | None | es |
| genitive | puell | a | is | rum |
| dative | puell | a | i | bus |
| accusative | puell | a | m | s |
| ablative | puell | a | none | bus |
When speaking in everyday conversation, Latin speakers would shorten the word in their pronunciation so long as it still made sense. If you go to New Orleans you will likely hear someone say 'prowly'. This is not a new dish at a resturaunt or a new new code name for the police, it is actually the local pronunciation of the word
probably. It is ok to shorten this word because when it is shortened everyone can still understand it. The Latins did the same thing. It is known that
I can change to
E and vice versa, so we can see that pattern in the dative singular of all declensions. The
IS of the genitive was kept in the 3rd declension, shortened in the 1st, 2nd, and 5th and slightly altered in the 4th. The 'add
M' rule of the accusative singular is seen in the altering of the stem vowel in the 2nd and 3rd declensions. The
ES of the nominative plural became
E in 1st,
I in 2nd, and
US in 4th. The
RUM of the genitive plural was shortened in the 3rd and 4th declensions. The accusative plural as a rule never changes, but keep in mind that neuter words followed a different pattern of using
A for the accusative plural, and all neuters took the accusative singular or plural for the nominative of the same number. The
BUS of the dative/ ablative plural was shortened to
IS in the 1st and 2nd declensions but kept in the others. The 4th declension has a tendency to copy the
IBUS of the 3rd in some authors but retain the
UBUS in others. When studying Latin declensions you really should strive to memorize the patterns, but also look to see how they are similar to other patterns in the language as it will help you to remember. Also note that the
IS of the genitive singular is what eventually gave us the word
HIS and the 'add 's'" rule of English. Latin also gave us the 'add 's'" to make a plural by way of the accusative plural. If you study other inflexive languages related to Latin, such as Greek, you will notice even similarities across languages.