of·fi·cial·ly /-ˈfɪʃ(ə)lɪ/ 副詞
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 verified or rendered; letters officially communicated; persons officially notified.
adv 1: in an official role; "officially, he is in charge";
"officially responsible" [ant: unofficially]
2: with official authorization; "the club will be formally
recognized" [syn: formally]