opin - outs
- opinion leader
- opinion magazine
- opinion molding
- opinion page
- opposite Olivier
- opposite the prompter's side
- opposition
- opposition newspaper
- optic fiber
- optical brightening agent
- optical CD player
- optical disk
- optical disk jukebox
- optical viewfinder
- option to veto
- or the actor's right
- orchestra light
- orchestra pit
- orchestra stalls
