Definition of "Stipulation" :

noun: a restriction that is insisted upon as a condition for an agreement

noun: an assumption on which rests the validity or effect of something else

noun: (law) an agreement or concession made by parties in a judicial proceeding (or by their attorneys) relating to the business before the court; must be in writing unless they are part of the court record

"A stipulation of fact was made in order to avoid delay."