stipulate

(verb) specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement. Synonyms: qualify, condition, specify. Examples: "The will stipulates that she can live in the house for the rest of her life." "The contract stipulates the dates of the payments."

(verb) give a guarantee or promise of. Example: "They stipulated to release all the prisoners."

(verb) make an oral contract or agreement in the verbal form of question and answer that is necessary to give it legal force.