(n) operation center
operation centre
(n) operation twist
(n) operations research
(n) opposition party
(n) orientation
(n) original content
(adj-no) orthopanchromatic
(n) (comp) on-board computer
(n) (comp) on-line job-hunting
(n) online auction
(n) (comp) online computer
(n) (comp) on-line sign up
online sign-up
(n) online shopping
(n) (comp) online software
(n) (comp) on-line database
online database
(n) (comp) online debugging
(n) (comp) online backup
(n) (comp) online real time
(n) (comp) online banking facilities
(n) counter display
(n) (comp) cut and copy function
(n) Cabernet Sauvignon (wine grape variety)
(n) color combination
colour combination
(n) California condor (Gymnogyps californianus)
(n) current English
(n) Kant-Laplace nebular hypothesis
(n) country elevator
(n) country music
(n) company economist
(n) (comp) garbage collection
GC