n. - 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.
n. - The agency by which the law excludes evidence to dispute
certain admissions, which the policy of the law treats as indisputable.