This is the 12828th most frequent Turkish word.
içerisi
The inside; the interior.
Here, 'içerisi' refers to the interior or inner space of the specific noun mentioned, which is 'house.'
Bu evin içerisi çok geniş.
The inside of this house is very spacious.
In this case, 'içerisi' is used to denote a general interior space relative to the exterior condition being described.
Hava soğuk, içerisi daha sıcak.
It is cold outside, the inside is warmer.
'İçerisi' here emphasizes the inner part of the cave, typically expressing a spatial relation.