(n) office automation
(n) off-the-job training
(n) operations research
OR
(n) (comp) Operations manuals
(n) (comp) operating-system
OS
(n) operating margin
(n) (comp) Oracle Applications
(n) orthophenyl phenol
OPP
(n) on-the-job training
(n) (comp) online computer
(n) (comp) online teller-machine
(n) (comp) online directory
(n) (comp) on-line trading
(n) (comp) on-line volume management
(n) (comp) cursor control key
(n) cassette tape recorder
(n) color coordination
(n) color conditioning
colour conditioning
(n) color reversal film (colour)
(n) cultural studies
(n) (comp) keep alive message
(n) keyhole journalism
(n) (comp) keyboard shortcut
(n) bing-bong bang-bong (Big Ben chimes, used as a bell in Japanese schools)
(n) cash on delivery
COD
(n) cash dispenser
(n) character display
(n) cuticle remover
(n) Queen's English
(P)
(n) (comp) client-server model