This is the 51st most frequent Indonesian word.
kedua
"Both" or "second."
Here, 'kedua' is used as a term indicating ordinal position, namely 'second', within a family setting.
Dia adalah anak kedua dalam keluarganya.
He is the second child in his family.
In this case, 'kedua' refers collectively to 'both' persons or objects mentioned.
Kedua teman saya datang ke pesta tadi malam.
Both of my friends came to the party last night.
Here, 'kedua' is used to indicate that both items (hands) are involved.