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n. a bar or impediment (obstruction) which precludes a person from asserting a fact or a right or prevents one from denying a fact. Such a hindrance is due to a person's actions, conduct, statements, admissions, failure to act or judgment against the person in an identical legal case. Estoppel includes being barred by false representation or concealment (equitable estoppel), failure to take legal action until the other party is prejudiced by the delay (estoppel by laches), and a court ruling against the party on the same matter in a different case (collateral estoppel).