In practice. An assembly or board of persons to whom the consideration or management of any matter is committed or referred by some court. Lloyd v. Hart, 2 Pa. 473, 45 Am. Dee. 012; Farrar v. Eastman, 5 Me. 345. An individual or body to whom others have delegated or committed a particular duty, or who have taken on themselves to perform it in the expectation of their act being confirmed by the body they profess to represent or act for. 15 Mees. & W. 529. The term is especially applied to the person or persons who are invested, by order of the proper court, with the guardianship of the person and estate of one who has been adjudged a lunatic.