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

See also: official

Antonym: unofficially

• modicum
• modifiable
• modification
• modified
• modified American plan
• modified radical mastectomy
• modifier
• modifier gene
• modify
• Modigliani
• modillion
• modiolus
• modish
• modishly
• modishness
• modiste
• mods
• modular
• modulate
• modulated
• modulation
• modulator
• module
• modulo
• modulus