WordNet Dictionary- [adv] in an official role; "officially, he is in charge"; "officially responsible"
- [adv] with official authorization; "the club will be formally recognized"
Webster's 1913 Dictionary\Of*fi"cial*ly\, adv. 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 vertified or rendered; letters officially communicated; persons officially notified.