Etymology
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formally (adv.)

late 14c., "in good form, in an orderly manner," also "by kind," from formal + -ly (2). Meaning "in prescribed or customary form" is from 1560s.

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Definitions of formally

formally (adv.)
with official authorization;
the club will be formally recognized
Synonyms: officially
formally (adv.)
in a formal manner;
he was dressed rather formally
From wordnet.princeton.edu