Yhdistyksensä
Yhdistyksensä is a Finnish word that translates to "its association" or "their association". It is a possessive form of the word "yhdistys", which means "association", "society", or "organization". The suffix "-nsä" indicates possession by a third person, singular or plural. Therefore, "yhdistyksensä" refers to an association belonging to someone or something previously mentioned or understood from the context.
In Finnish grammar, this word would be used in sentences where a possessive relationship between an association