novocentenary /nō-vō-sen-tēˈnə-ri/

A 900th anniversary

• operands
• operant
• operant conditioning
• operants
• operas
• opera seria
• opera singer
• opera singers
• operate
• operated
• operates
• operatic
• operatically
• operating
• operating room
• operating rooms
• operating system
• operating systems
• operating table
• operating tables
• operating theatre
• operating theatres
• operation
• operational
• operational amplifier