To state something is true. 1) In civil cases, the defendants will admit or deny each allegation in their answers filed with the court. When the defendant admits an allegation, that claim need not be proved in trial. 2) In criminal law, to agree that a fact is true or to confess guilt. 3) To allow something to come in as evidence in a trial, as when the judge rules, "Exhiibit D, plaintiff's letter, is admitted into evidence."