Hypertext Webster Gateway: "estoppel"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Estoppel \Es*top"pel\, n. [From {Estop}.] (Law)
(a) A stop; an obstruction or bar to one's alleging or
denying a fact contrary to his own previous action,
allegation, or denial; an admission, by words or conduct,
which induces another to purchase rights, against which
the party making such admission can not take a position
inconsistent with the admission.
(b) The agency by which the law excludes evidence to dispute
certain admissions, which the policy of the law treats as
indisputable. --Wharton. --Stephen. --Burrill.
From WordNet (r) 1.7 (wn)
estoppel
n : a rule of evidence whereby a person is barred from denying
the truth of a fact that has already been settled
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