This is the 1943rd most frequent Turkish word.
kuruluşunun
"Of its establishment" or "of its foundation."
The word 'kuruluşunun' in this sentence is in the third-person possessive form, indicating 'of the foundation (of).' It refers to the foundation of the Republic.
Cumhuriyetin kuruluşunun 100. yılı kutlanacak.
The 100th anniversary of the Republic's foundation will be celebrated.
Here, 'kuruluşunun' signifies 'of the establishment,' referring to the founding purpose of the museum.
Bu müzenin kuruluşunun amacı sanatı tanıtmaktır.
The purpose of this museum's establishment is to promote art.
In this sentence, 'kuruluşunun' indicates 'of the establishment (of).' It provides a possessive structure, linking to the company's establishment year.