This is the 203rd most frequent Indonesian word.
api
Fire.
In this sentence, 'api' means 'fire,' referring to a burning flame.
Api itu sangat panas.
That fire is very hot.
Here, 'api' is part of the compound noun 'kereta api,' which means 'train' in Indonesian.
Kereta api akan segera datang.
The train will arrive soon.
In this context, 'api' is used metaphorically to describe a fervent or passionate spirit.