Note: The usual plural in British English is '~x'. The usual plural in American English is '~s'.
1.
A ~ is an office, organization, or government department that collects and distributes information.
...the Federal Bureau of Investigation.
...the Citizens’ Advice Bureau.
N-COUNT; N-IN-NAMES
2.
A ~ is an office of a company or organization which has its main office in another town or country. (mainly AM BUSINESS)
...the Wall Street Journal’s Washington ~.
= office
N-COUNT
3.
A ~ is a writing desk with shelves and drawers and a lid that opens to form the writing surface. (BRIT)
N-COUNT
4.
A ~ is a chest of drawers. (AM)
N-COUNT