Source : Webster's Revised Unabridged Dictionary (1913)

Formally \Form"al*ly\, adv.
   In a formal manner; essentially; characteristically;
   expressly; regularly; ceremoniously; precisely.

         That which formally makes this [charity] a Christian
         grace, is the spring from which it flows. --Smalridge.

         You and your followers do stand formally divided
         against the authorized guides of the church and rest of
         the people.                              --Hooker.

Source : WordNet®

formally
     adv 1: with official authorization; "the club will be formally
            recognized" [syn: {officially}]
     2: in a formal manner; "he was dressed rather formally" [syn: {with
        formality}] [ant: {informally}]