This is the 167th most frequent Malay word.
kedua
"Second" or "both."
In this sentence, 'kedua-duanya' is used to refer collectively to both individuals mentioned earlier.
Saya mempunyai dua saudara lelaki, dan kedua-duanya bekerja sebagai jurutera.
I have two brothers, and both of them work as engineers.
Here, 'kedua' refers specifically to the second item in a sequence.
Dia telah selesai membaca buku pertama, tetapi belum memulakan buku kedua.
She has finished reading the first book, but has not started the second book.
In this context, 'kedua-dua' refers collectively to two groups that are mentioned.