WordNet (r) 3.0 (2006):

judicial admission
    n 1: (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" [syn: stipulation,
         judicial admission]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

JUDICIAL ADMISSIONS. Those which are generally made in writing in court by
the attorney of the party; they appear upon the record, as in the pleadings
and the like.