ceremonially
Concise Oxford English Dictionary © 2008 Oxford University Press:
ceremonial/serɪˈməʊniəl/
▶adjective
- 1 relating to or used for ceremonies.
- 2 (of a post or role) involving only nominal authority or power.
- 1 the ritual procedures observed at grand formal occasions.
- 2 a ceremony.
– derivatives
ceremonialism noun,
ceremonialist noun,
ceremonially adverb.
ceremonialism noun,
ceremonialist noun,
ceremonially adverb.
'ceremonially' also found in these Oxford entries:

