First Declension
First declension is the gentlest doorway into Latin nouns: nominative ends in -a, genitive in -ae, and almost every member is feminine.
Learn stella, stellae ("star") and you've effectively learned thousands of words — aqua, vīta, fortūna, victōria all march in the same rhythm.
Three small things will trip you up early. First, -ae does double duty as genitive singular AND nominative plural, so context decides.
Second, a handful of common nouns — nauta (sailor), agricola (farmer), poēta (poet) — are 1st declension by form but masculine by meaning, so they take masculine adjectives (bonus nauta, not bona nauta).
Third, Rōmae ("at Rome") looks genitive but is actually a leftover locative case. Get those three quirks in your ear, and the whole declension is yours.
Stem in -ā; nominative -a, genitive -ae. Almost always feminine.
-ae is BOTH genitive singular AND nominative plural — context decides which.
| Case | Singular | Plural |
|---|---|---|
| Nom. | stell-a | stell-ae |
| Gen. | stell-ae | stell-ārum |
| Dat. | stell-ae | stell-īs |
| Acc. | stell-am | stell-ās |
| Abl. | stell-ā | stell-īs |
| Voc. | stell-a | stell-ae |
| Case | Singular | Plural |
|---|---|---|
| Nom. | naut-a | naut-ae |
| Gen. | naut-ae | naut-ārum |
| Dat. | naut-ae | naut-īs |
| Acc. | naut-am | naut-ās |
| Abl. | naut-ā | naut-īs |
| Case | Singular | Plural |
|---|---|---|
| Nom. | fīli-a | fīli-ae |
| Gen. | fīli-ae | fīli-ārum |
| Dat. | fīli-ae | fīli-ābus |
| Acc. | fīli-am | fīli-ās |
| Abl. | fīli-ā | fīli-ābus |
See It In Action
— B. G. i. 1
Gallia is the textbook 1st-decl noun: -a nominative, feminine, taking feminine omnis and feminine divīsa. Caesar's most famous opener is also a clean paradigm specimen.
— B. G. ii. 2
cōpia ("supply, abundance") is feminine 1st-decl, doing subject duty in -a. Watch for the genitive pabulī (2nd decl.) hanging off it — "supply OF fodder."
— B. G. iii. 23
pugnae here is genitive singular, not nominative plural — the verb already has its subject (the general, unstated). When -ae shows up, ALWAYS ask which job it's doing.
Both end in -ae. Latin gives you no article to disambiguate, so you read for the syntax.
"of the…" — belongs to another noun
lūx stellae
the light of the star
subject (more than one)
stellae lūcent
the stars shine
Tip: Ask: does this -ae word have its OWN verb (then it's nom. pl. subject), or is it leaning on another noun (then it's gen. sg.)?
In fīlia agricolae, what case and number is agricolae, and what does the phrase mean?
Study Tips
- •Memorize the stella paradigm cold before touching anything else — it's the template for thousands of nouns and the model every other declension contrasts itself against.
- •When you see -ae, ask yourself: is this word doing something (subject) or describing what something belongs to (genitive)? Same form, two very different jobs.
- •Make a tiny mental flashcard for nauta, agricola, poēta (and proper names like Catilīna). They're masculine — pair them with bonus, not bona.
- •Don't be surprised by Rōmae, fīliābus, or pater familiās — they're not exceptions you need to invent forms for, just leftovers from older Latin that survived in fixed phrases.