1. In a ceremonious manner
   - ceremoniously 
2. In a ceremonial manner
   "he was ceremonially sworn in as President"
   - ritually, ritualistically

See also: ceremonial

• Opisthocomus
• Opisthocomus hoazin
• Opisthognathidae
• opisthognathous
• opisthorchiasis
• opisthotonos
• opium
• opium addict
• opium den
• opium poppy
• opium taker
• opopanax
• Oporto
• opossum
• opossum rat
• opossum shrimp
• opossum wood
• Oppenheimer
• oppidan
• opponent
• opportune
• opportunely
• opportuneness
• opportunism
• opportunist