The Curriculum
Chapter 7: Third Declension & Fourth Conjugation

Lesson 17: 3rd Declension Nouns Vocabulary + 3rd Declension Nouns Declension

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3rd Declension Nouns Vocab + Declension

Vocabulary

  • pater, patris (m) - father

  • mater, matris (f) - mother

  • rex, regis (m) - king

  • dux, ducis (m) - leader, general

  • frater, fratris (m) - brother

  • soror, sororis (f) - sister

  • civis, civis (m/f) - citizen

  • miles, militis (m) - soldier

  • homo, hominis (m) - man, human

  • uxor, uxoris (f) - wife

  • legio, legionis (f) - legion

  • virtus, virtutis (f) - courage, virtue

  • corpus, corporis (n) - body

  • amor, amoris (m) - love

  • iter, itineris (n) - journey, route

Conjugation

Third declension nouns can be masculine, feminine, or neuter, and have variable nominative singular endings. However, they typically share the same set of endings in other cases.

Masculine & Feminine Singular Endings

Nominative: varies

Genitive: -is

Dative: -ī

Accusative: -em

Ablative: -e

Masculine & Feminine Plural Endings

Nominative: -ēs

Genitive: -um

Dative: -ibus

Accusative: -ēs

Ablative: -ibus

Neuter Singular Endings

Nominative: varies

Genitive: -is

Dative: -ī

Accusative: same as nominative

Ablative: -e

Example Conjugation (Masculine)

Using rex, regis (m. - king):

Singular

Nominative: rex (the king)

Genitive: regis (of the king)

Dative: regi (to/for the king)

Accusative: regem (the king, direct object)

Ablative: rege (by/with/from the king)

Plural

Nominative: reges (the kings)

Genitive: regum (of the kings)

Dative: regibus (to/for the kings)

Accusative: reges (the kings, direct object)

Ablative: regibus (by/with/from the kings)

Example Conjugation (Neuter)

Using corpus, corporis (n. - body):

Singular

Nominative: corpus (the body)

Genitive: corporis (of the body)

Dative: corpori (to/for the body)

Accusative: corpus (the body, direct object)

Ablative: corpore (by/with/from the body)

Plural

Nominative: corpora (the bodies)

Genitive: corporum (of the bodies)

Dative: corporibus (to/for the bodies)

Accusative: corpora (the bodies, direct object)

Ablative: corporibus (by/with/from the bodies)

Lesson Review Instructions:

Before checking the answers, write your responses on paper or in a digital document. Carefully review your work, ensuring each answer is complete. Once finished, compare your responses to the correct answers, noting any mistakes. If you find errors, identify patterns, revisit the lesson material, and review relevant vocabulary or grammar rules. Strengthen your understanding by practicing corrections and applying what you’ve learned in new examples.

Part A – Vocabulary
Match the Latin word to its English meaning.

  1. pater, patris

  2. dux, ducis

  3. corpus, corporis

  4. iter, itineris

  5. virtus, virtutis

Part B – Case Forms
Give the requested forms.

  1. Genitive singular of rex

  2. Accusative plural of soror

  3. Dative plural of homo

  4. Nominative plural of corpus

  5. Ablative singular of mate

Lesson Answers Instructions

Compare your answers to the correct ones, paying attention to differences and patterns in mistakes. If you spot errors, review the related lesson material and take notes on tricky concepts. For further practice, rewrite corrected answers or create new sentences using the same rules. If anything remains unclear, revisit previous lessons or seek clarification. Regular review and application will reinforce your learning and improve retention.

  • Part A – Vocabulary

    1. father

    2. leader, general

    3. body

    4. journey, route

    5. courage, virtue

    Part B – Case Forms

    1. regis

    2. sorores

    3. hominibus

    4. corpora

    5. matrenswers Here