Promise
Appointment, Pact
noun, verbal noun
A promise bundle is still a promise no matter how many you have wrapped up there. One promise is just another promise which is just another promise.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
うん、分かった。約束する！
Sure, understood. I promise!
ひどい。誰にも言わない約束だったじゃん。
That's awful. It was a promise not to tell anyone, right?
すいません、その日は他に約束があるんです。
I'm sorry, I have another commitment on that day.