This is the 7730th most frequent Turkish word.
kocaeli̇
Kocaeli is a province in northwestern Turkey.
In this sentence, 'Kocaeli' specifies a location, indicating the city where the action will take place.
Kocaeli'nde bu yaz bir ev kiralamayı düşünüyoruz.
We are considering renting a house in Kocaeli this summer.
Here, 'Kocaeli' is part of the name of an institution, 'Kocaeli University'.
Arkadaşım Kocaeli Üniversitesi'nde mühendislik okuyor.
My friend studies engineering at Kocaeli University.
Here, 'Kocaeli' is used as a proper noun referring to a specific city in Turkey.