What is Board?

Legal Definition
This word is used to designate all the magistrates of a city or borough, or all the managers or directors of any institution; as, the board of aldermen; the board of directors of the Bank of North America. The majority of the board have in general the power to perform the acts of the whole board, but sometimes they are restrained by their charters, and it requires a greater number to perform certain acts.
-- Bouviers Law Dictionary
Legal Definition
A committee of persons organized under authority of law in order to exercise certain authorities, have oversight or control of certain matters or discharge certain functions of a magisterial, representative or fiduciary character. Thus, "board of aldermen," "board of health," "board of directors," "board of works." Also lodging, food, entertainment, furnished to a guest at an inn or boardinghouse.
-- Black's Law Dictionary
Legal Definition
To furnish with food; meals; a body having the control or management of public or private affairs.
-- Ballentine's Law Dictionary