1. Nouns of the third declension
Chapter 3
Nouns of the third declension

2. How do we recognize a noun of the 3rd Declension?
The genitive of the noun ending in –is
The nominative varies
Remember:
Genitive of 1st declension: -ae
Genitive of 2nd declension: -ī

3. The Third Declension

4. Exemplum I: dux, ducis, m. leader
Case
Singular
Plural
Nominative
dux
ducēs
Genitive
ducis
ducum
Dative
duci
ducibus
Accusative
ducem
Ablative
duce

5. Exemplum II: soror, sororis, f. sister
Case
Singular
Plural
Nominative
soror
sororēs
Genitive
sororis
sororum
Dative
sorori
sororibus
Accusative
sororem
Ablative
sorore

6. Try it! Decline the following:
lēx, legis, f. law
rēx, regis, m. king

7. Cantemus!
Follow the Lyrical Latin worksheet for the following activity:

8. 3rd Declension Nouns: Masculine or Feminine
Masculine Only
Feminine Only
pater, patris, m. “father”
frater, fratris, m. “brother”
rex, regis, m. “king”
dux, ducis, m. “leader”
miles, militis, m. “soldier”
victor, victoris, m. “victor”
dens, dentis, m. “tooth”
mons, montis, m. “mountain”
fons, fontis, m. “spring”
pons, pontis, m. “bridge”
mater, matris, f. “mother”
soror, sororis, f. “sister”
arx, arcis, f. “citadel”
lex, legis, f. “law”
urbs, urbis, f. “city”
navis, navis, f. “ship”
pars, partis, f. “part”
condicio, condicionis, f. “condition”
claritas, claritatis, f. “clarity; fame”

9. 3rd Declension Nouns: Masculine and Feminine
hostis, hostis, mf. “enemy”
parens, parentis, mf. “parent”

10. Practice Decline the following 3rd Declension nouns:
hostis, hostis, mf “enemy”
arx, arcis, f. “citadel”