This is the 4753rd most frequent Korean word.
계약으로
"By contract" or "through a contract."
Here, '계약으로' means 'through this contract,' describing the means or method enabling cooperation.
이 계약으로 우리는 상호 협력하게 됩니다.
Through this contract, we will cooperate with each other.
'계약으로' indicates 'through the contract,' indicating that the contract serves as the medium for resolving disputes.
그들은 계약으로 모든 분쟁을 해결하기로 결정했습니다.
They decided to resolve all disputes through the contract.
In this sentence, '계약으로' means 'through a contract,' signifying the formal method by which the transaction occurred.