Learning Latin Declensions — The 5 Declensions Explained Simply
Latin declension is the foundation of Latin grammar. Without it, no sentence can be read—because in Latin, it is not word order that indicates which noun is the subject or object, but the ending. Anyone who has a firm grasp of declensions can read Latin. Those who don’t know them can only guess. This article is part of Lapicida’s “Learn Latin” section.
- What is a declension, and why do you need it?
- The 5 Latin declensions with tables and examples
- How do I tell which declension a noun belongs to?
- Common Mistakes—and How to Avoid Them
What is Latin declension?
Latin declension refers to how a noun changes depending on its function in a sentence (case). In Latin, there are 6 cases (nominative, genitive, dative, accusative, ablative, vocative) and 5 declension classes, to which every noun belongs. You can identify the declension by the genitive singular form, which is always listed in the dictionary.
More blog posts on this topic:
An Overview of the 5 Latin Declensions
| Declension | Genitive Singular | Example | Gender | Frequency |
|---|---|---|---|---|
| 1st Declension (a-declension) | -ae | puella, puellae | mostly feminine | ⭐⭐⭐⭐ very common |
| 2nd declension (o-declension) | -i | dominus, domini | masc./neut. | ⭐⭐⭐⭐ very common |
| 3rd declension (consonantal) | -is | rex, regis | masculine/feminine/neuter | ⭐⭐⭐ common |
| 4th Declension (u-declension) | -us | manus, manus | mostly masc. | ⭐⭐ rare |
| 5th declension (e-declension) | -ei | res, rei | mostly feminine | ⭐ very rare |
The 1st and 2nd declensions are among the most common classes—they should be introduced as early as Lesson 1 in the textbook. Anyone who has a firm grasp of these two can read most school texts. All other grammar topics in the “Learning Latin” section.
1st and 2nd Declensions: The Most Important Tables
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1st Declension (a-declension) — puella, puellae f. (the girl)
| Case | Singular | Plural | Function |
|---|---|---|---|
| Nominative | puella | puellae | Subject |
| Genitive | puellae | puellarum | Possession / Belonging |
| Dative | puellae | puellis | indirect object |
| Accusative | puellam | puellas | direct object |
| Ablative | puella | puellis | Circumstantial / Instrumental |
| Vocative | puella | puellae | Form of address |
2nd Declension (o-declension) — dominus, domini m. (the lord)
| Case | Singular | Plural | Function |
|---|---|---|---|
| Nominative | dominus | domini | Subject |
| Genitive | domini | dominorum | Possessive |
| Dative | domino | dominis | indirect object |
| Accusative | dominum | dominos | direct object |
| Ablative | domino | dominis | Circumstantial |
| Vocative | domine | domini | Form of address |
Tip: In Lapicida, the form trainer focuses on these very endings—actively and using spaced repetition, not just passive viewing.
Actively practice Latin declensions—don’t just memorize them
3rd Declension in Latin — Consonantal and “i” Declension
The 3rd declension is the most diverse and includes masculine, feminine, and neuter nouns. Distinguishing feature: The genitive singular ends in -is. There are two subgroups—consonantal stems (such as rex, regis) and i-stems (such as civis, civis):
| Case | rex (m.) — Sing. | rex (m.) — Pl. | civis (m./f.) — Sing. | civis (m./f.) — Pl. |
|---|---|---|---|---|
| Nominative | rex | reges | civis | cives |
| Gen. | regis | regum | civis | civium |
| Dat. | regi | regibus | civi | civibus |
| Acc. | regem | reges | civem | cives |
| Abl. | rege | regibus | cive | civibus |
Difference in i-stems: Gen. Pl. ends in -ium (instead of -um). Typical i-stem words: civis, turris, navis, urbs. Neuter of the 3rd declension: Nom./Acc. Pl. ends in -a or -ia (e.g., mare → maria).
4th and 5th Declensions in Latin — u- and e-Declensions
You can recognize the 4th declension (u-declension) by the genitive singular ending in -ūs—not to be confused with the nominative singular ending in -us of the o-declension! Mostly masculine; feminine: manus (hand). You can recognize the 5th declension (e-declension) by the genitive singular ending in -ei. Almost exclusively feminine — important exception: dies (day, masculine):
| Case | manus (f.) — sing. | manus — pl. | res (f.) — sing. | res — Pl. |
|---|---|---|---|---|
| Nominative | manus | manūs | res | res |
| Gen. | manūs | manuum | rei | rerum |
| Dat. | manuī | manibus | rei | rebus |
| Acc. | manum | manūs | rem | res |
| Abl. | manū | manibus | re | rebus |
Mnemonic for the 4th declension: Gen. Sing. = -ūs (with a long u!) — as opposed to the short -us in the Nom. Sing. of the o-declension. More examples: exercitus (army), senatus (Senate), domus (house, mixed). Mnemonic for the 5th declension: Only two words occur frequently in Latin: res (thing) and dies (day).
Common Mistakes in Latin Declension
- Not learning the genitive singular: If you only know the nominative, you often can’t determine the declension. Always learn the nominative, genitive, and gender together: puella, puellae, f.
- Nominative = Accusative (Neuter): For neuter nouns, the nominative and accusative are identical. This can be surprising in a sentence—you have to deduce the case from the context.
- Confusing the genitive plural of the 1st and 2nd declensions: 1st declension: -arum, 2nd declension: -orum. They sound similar but are different.
- Dative and ablative plural are identical: In all declensions, the dative plural and ablative plural are the same (-is in the 1st and 2nd declensions). The correct case is determined by the word’s function in the sentence.
Latin Cases Explained: You can find an overview of all 6 cases and their functions in the article “Latin Cases — Function and Usage.”
Declension is part of the larger grammatical system—an overview of all areas can be found in the Latin Grammar Overview.
At the heart of declension are Latin nouns—there you’ll find all five declensions with ending tables.
Frequently Asked Questions — Latin Declension
How many declensions are there in Latin?
There are 5 declensions in Latin. By far the most common are the 1st (a-declension, mostly feminine) and the 2nd (o-declension, mostly masculine/neuter). The 3rd declension is more varied, while the 4th and 5th are rare.
How can I tell which declension a noun belongs to?
By the genitive singular ending: -ae = 1st declension, -i = 2nd declension, -is = 3rd declension, -us = 4th declension, -ei = 5th declension. That is why dictionaries always list both the nominative and genitive forms.
What does “case” mean in Latin declension?
Case refers to the grammatical function of a noun in a sentence. In Latin, there are 6 cases: nominative (subject), genitive (possession), dative (indirect object), accusative (direct object), ablative (circumstance/means), and vocative (address). The ending indicates which case a noun is in.
Do I have to learn all five declensions for the Latinum?
Yes—but to varying degrees. The 1st and 2nd declensions must be mastered perfectly. The 3rd declension is important because it includes a large number of nouns. The 4th and 5th declensions are less common, but you must be able to recognize them.
Practice Latin Declensions Now
Understand Latin instead of cramming — try it right now.
