This is the 876th most frequent Indonesian word.
perihal
"Perihal" means "about" or "regarding."
In this sentence, 'perihal' is used to indicate the topic of discussion.
Saya berbicara perihal rencana perjalanan kita.
I talked about the plan for our trip.
Here, 'perihal' refers to the subject or matter being investigated.
Kita perlu menyelidiki perihal kehilangan itu.
We need to investigate the matter of that disappearance.
In this usage, 'perihal' introduces the main topic explored in the book.