(1):

(n.) A chest of drawers for clothes, especially when made as an ornamental piece of furniture.

(2):

(n.) Hence: A department of public business requiring a force of clerks; the body of officials in a department who labor under the direction of a chief.

(3):

(n.) Originally, a desk or writing table with drawers for papers.

(4):

(n.) The place where such a bureau is used; an office where business requiring writing is transacted.