Wordnet 3.0
NOUN (2)
1. 
 the government department in charge of domestic affairs; 
2. 
 (usually plural) the office that serves as the administrative center of an enterprise; 
- Example: "many companies have their headquarters in New York"[syn: headquarters, central office, main office, home office, home base]
WordNet (r) 3.0 (2006):
Home Office
    n 1: the government department in charge of domestic affairs
    2: (usually plural) the office that serves as the administrative
       center of an enterprise; "many companies have their
       headquarters in New York" [syn: headquarters, central
       office, main office, home office, home base]