Learn Latin from the Romans A Complete Introductory Course Using Textbooks from the Roman Empire

In addition to the first and second declensions, Latin has a third declension. Nouns of the third declension can be masculine, feminine, or neuter, and all three genders decline similarly, except that in the neuter the nominative, vocative, and accusative are always the same as each other. The nominatives singular of third-declension nouns are unpredictable: the first form in the vocabulary entry will always be the nominative and vocative (and accusative in the case of neuter nouns) singular, but there is no reliable way of predicting what the relationship between that form and the other forms in the paradigm will be.