/səbˈstænʃəl pərˈfɔrməns/ – Phrase
Definition: việc thực hiện một phần lớn hoặc đáng kể của một hợp đồng hoặc cam kết mà không cần phải hoàn thành tất cả các yêu cầu chi tiết.
A more thorough explanation: (CONTRACT LAW) the legal principle that even if a person completes most of what they are bound to do under a contract, they can still be sued for that part of the contract that has not been completed
Example: When a government contractor fails to perform completely as required by the contract, in many cases the government is still required to pay for work that was performed under the substantial performance rules.