Agreement
Noun and する verb
けいやく
あの事件が先方に契約を解除させたんだよ。
That incident led them to cancel the contract.
I pledge and promise to do that thing... so much so, I'm willing to sign a contract about it.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.