A more thorough explanation:

A stipulation is an agreement or assent. It is an old-fashioned word that means when two or more people agree to something.

• Before signing the contract, both parties made a stipulation that the payment would be made in installments.
• The judge made a stipulation that the defendant must complete community service as part of their sentence.

These examples show how stipulation is used to describe an agreement or condition that is set before something can happen. In the first example, the stipulation is about the payment terms of a contract. In the second example, the stipulation is a condition of the defendant's sentence.