adverb (r)

• in an official role(adv.all)

  Example:
  Officially, he is in charge.
  Officially responsible.
  

  Antonym:
  unofficially
  

  source: wordnet30
• with official authorization(adv.all)

  Synonym:
  formally
  

  source: wordnet30
• By the proper officer; by virtue of the proper authority; in pursuance of the special powers vested in an officer or office; as, accounts or reports officially verified or rendered; letters officially communicated; persons officially notified.(adverb)

  source: webster1913