1. In an official role
   "officially, he is in charge"; "officially responsible" 
2. With official authorization
   - formally

See also: official

Antonym: unofficially

• bathyscaph
• bathyscaphe
• bathysphere
• Batidaceae
• batik
• Batis
• Batis maritima
• batiste
• batman
• Batna
• Batoidei
• batoko palm
• baton
• Baton Rouge
• Baton Rouge Bridge
• bronze medal
• Bronze Star
• Bronze Star Medal
• bronze-red
• bronzed
• bronzed diabetes
• bronzer
• bronzy
• brooch
• brood