käändeklassi
A käändeklass is a grammatical concept primarily found in some Finnic languages, notably Estonian. It refers to a group of nouns that share similar patterns of declension, meaning they change their form in predictable ways when taking on different grammatical cases. Instead of each noun having a unique set of endings for each case, nouns are categorized into käändeklassid, and all nouns within a specific class will generally follow the same rules for case marking. This system simplifies the grammar of the language by reducing the number of irregular forms and providing a more systematic approach to noun inflection.
The number of käändeklassid can vary between Finnic languages, but they serve the same fundamental purpose: