Teatterin

Teatterin is the genitive singular form of the Finnish noun teatteri, meaning "the theatre." It is used to indicate possession or association with a theatre, as in teatterin ovet ("the theatre's doors"), teatterin ohjelmisto ("the theatre's program"), or teatterin johtaja ("the theatre's director"). The form commonly appears in phrases that attribute a property or feature to a specific theatre and can function as a determinant in compound expressions.

In Finnish grammar, teatterin is formed by taking the base teatteri and adding the genitive ending -in. The corresponding plural genitive is teatterien, meaning "theatres'." The teatterin form can be used with various other cases of the noun that follows, depending on the sentence structure and meaning.

Etymology traces teatteri to the Swedish teater, which in turn derives from the French théâtre, ultimately from Latin theatrum and Greek theatron. The genitive teatterin reflects standard Finnish inflection patterns for nouns ending in -i.

See also Teatteri, which refers to the theatre as a concept or building, and to related terms in Finnish and historical theatre terminology such as théâtre (French) and theatron/theatrum in classical contexts. Teatterin illustrates how Finnish uses the genitive case to express ownership and association with cultural institutions.