Definition - What does Quasi-Judicial Body mean? A quasi-judicial body is a decision-making tribunal, board, agency or arbitrator that is granted certain powers similar to those of an official court of law. A quasi-judicial body is often organized under the powers given to a public administration to hear arguments, consider evidence, and make determinations of fact. Justipedia explains Quasi-Judicial BodyA quasi-judicial body is often said to possess powers of adjudication. In many instances, quasi-judicial bodies are how public administrative agencies make decisions. In certain fields, official judges presiding over criminal and civil courts of law lack the requisite expertise to make informed decisions. A quasi-judicial body may be organized to include experts more qualified to consider the facts in certain types of cases. The decisions made by quasi-judicial bodies are usually reviewable by an official court of law.