1. The ordinal number of eighty in counting order
   - eightieth

See also: ordinal

• Ofo
• oft
• often
• oftener
• oftenest
• oftenness
• oftentimes
• ofttimes
• Ogalala
• ogam
• Ogcocephalidae
• Ogden
• Ogden Nash
• ogdoad
• ogee
• ogee arch
• ogham
• ogive
• Oglala
• ogle
• ogler
• ogre
• ogreish
• ogress
• ogrish