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Latin Grammar Mini-Series | Lesson 16 - Third-Declension Adjectives
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There are two important rules to remember here:
(1) Third-declension adjectives are i-stem. That means their ablative singulars will end –i, their genitive plurals will end -ium, and neuter nominative and accusative plurals will end -ia.
(2) Third-declension adjectives can be one-, two-, or three-termination.
Just like some Latin nouns, some Latin adjectives are third-declension. That is, they have third-declension endings: *, -is, -i, -em, -e, and so on. But unlike third-declension nouns, third-declension adjectives are all i-stem. They have a genitive plural ending -ium, a neuter nominative and accusative plural ending -ia, and an ablative singular ending in all genders, -i.
Here’s an example of a third-declension adjective: brevis, breve, meaning “short.”
M/F I-Stem Neuter I-Stem
brevis breves breve brevia
brevis brevium → brevis brevium
brevi brevibus brevi brevibus
brevem breves/-is breve brevia
breve brevibus brevi brevibus
Some third declension adjectives have two nominative singular forms, for instance, fortis, forte. Fortis is the masculine and feminine form; forte is the neuter. This is called a two-termination adjective.
Other third-declension adjectives, especially those which have -r at the end of their base, have three nominative singular forms, such as acer, acris, acre. These are called three-termination adjectives.
For any adjectives which are two- or three-termination, all you do is drop the –is from the nominative singular feminine form and you have the base.
Take, for example, the two-termination adjective fortis, forte. Fortis is the nominative singular feminine form; drop the –is and you can see that the base is fort-.
For a three-termination adjective, do the same. So, for acer, acris, acre: the nominative singular feminine form is acris; drop the –is, and you can see that the base is acr-.
For one-termination adjectives, as we just noted, the genitive singular is required. So, for instance, the base of potens is potent-, which you get when you drop the –is ending from the genitive singular form.
Let’s do an exercise where you get to practice matching third-declension adjectives with first/second-declension nouns, or nouns of any declension as a matter of fact.
First, we’ll determine the decle