What does 'declension' mean?
it is Latin, second declension nouns.
In Latin, a noun can have many endings depending on how it is used in a sentence. Latin has five declensions the origin of which are explained in Latin history books. They each correspond to a grammar function: Nominative = subjects, Vocative = function for calling, questioning, Accusative = direct objects, Genitive = possessive nouns, eg of the master Dative = indirect objects, eg to/for the master Ablative = prepositional objects.
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