This is the 246th most frequent Indonesian word.
kecil
Small.
Here, 'kecil' is an adjective describing the size of the house.
Rumahnya kecil tetapi sangat nyaman.
The house is small but very comfortable.
In this sentence, 'mengecilkan' is a verb meaning 'to reduce or make smaller,' showing the causative form of the word 'kecil'.
Ia mengecilkan ukuran gambar untuk mengirimnya melalui email.
He reduced the size of the picture to send it via email.
Here, 'kekecilan' refers to the condition of being too small, indicating the result or state of becoming small.