tähtuse

Tähtuse is a term used in Estonian linguistics. It refers to the grammatical phenomenon of vowel harmony within a word. Specifically, it describes the tendency for vowels within a single word to belong to the same class, either front vowels (e, i, ö, ü) or back vowels (a, o, u). This is a common feature in Finnic languages, including Estonian.

The concept of tähtuse helps explain patterns in Estonian grammar, particularly in the formation of word stems and the addition of suffixes. While not all Estonian words strictly adhere to tähtuse, it remains a significant underlying principle that influences word structure and pronunciation. Understanding tähtuse is crucial for learners of Estonian to grasp the natural flow and systematic nature of the language. It's a characteristic that contributes to the distinctive sound and morphology of Estonian.