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

See also: official

Antonym: unofficially

• Arvicola
• Arvicola amphibius
• arvo
• arXiv
• Aryan
• aryl
• arytaenoid
• arytenoid
• arytenoid cartilage
• arête
• as
• as a formality
• as a group
• as a matter of fact
• as far as possible
• as follows
• as if
• as if by magic
• as it is
• as it were
• as luck would have it
• as much as possible
• as needed
• as of
• as of late