O - Abbreviations list
 o
ocean | octavo | old | order | out | over(s) | pint
 o’
of
 O
ocean | octavo | October | old | order | out | over | over(s) | oxygen
 OA
office automation | osteoarthritis
 o/a
on or about
 OAC
on approved credit
 OAM
Medal of the Order of Australia
 O & M
organization and method
 OAP
old-age pensioner
 OAS
Organization of American States
 OAUS
on an unrelated subject
 OB
obstetric | obstetrician | obstetrics | outside broadcast
 ob.
he or she died | oboe | obstetric | obstetrician | obstetrics
 Ob.
Obadiah
 Obad.
Obadiah
 obb.
obbligato
 OBC
Other Backward Classes
 OBE
Officer of the (Order of the) British Empire
 OBI
open buying on the Internet
 obj.
object | objection | objective
 obl.
oblique
 o.b.o.
or best offer
 obs.
obscure | observation | observatory | obsolete | obstetrics
 Obs.
Observatory
 OBSF
off-balance-sheet financing
 obstet.
obstetric | obstetrics
 OBTW
oh, by the way
 OC
Officer Commanding | oral contraceptive | organic carbon | original cover
 Oc.
Ocean
 o.c.
in the work or works cited
 o/c
overcharge
 OCAM
African and Malagasy Common Organization
 occ.
occident | occupation
 OCCAM
a computer programming language used in large multiprocessor or multi-user systems
 occas.
occasional | occasionally
 OCD
obsessive-compulsive disorder
 OCE
open collaboration environment
 OCF
operating cash flow
 OCR
official cash rate | optical character reader | optical character recognition
 OCS
Officer Candidate School
 oct.
octavo
 Oct.
October
 OD
Doctor of Optometry | Officer of the Day | olive drab | ordnance datum | overdose | overdraft | overdrawn
 o.d.
on demand | outside diameter | right eye
 O/D
overdraft | overdrawn
 ODA
operating department assistant
 ODP
ozone-depleting potential
 Oe
oersted
 OE
Old English
 OECD
Organization for Economic Cooperation and Development
 OEIC
open-ended investment company
 OEM
original equipment manufacturer
 OEO
Office of Economic Opportunity
 Ofcom
Office of Communications
 OFEX
off exchange
 off.
office | officer | official
 OFFER
Office of Electricity Regulation
 OFGAS
Office of Gas Supply
 OFM
Order of Minor Friars
 OFSTED
Office for Standards in Education
 OFT
Office of Fair Trading
 OFTEL
Office of Telecommunications
 OFWAT
Office of Water Services
 OG
Officer of the Guard | original gum
 o.g.
original gum | own goal
 OGD
oesophagogastroduodenoscopy
 O grade
Ordinary grade
 OH
occupational health | Ohio
 OHG
Old High German
 OHMS
On Her (or His) Majesty’s Service
 OHP
overhead projector
 OHV
off-highway vehicle | overhead valve
 OI
operating income
 OIC
oh, I see
 OINK
 
 OIRO
offers in the region of
 OJ
orange juice
 OJT
on-the-job training
 OK
all right | Oklahoma
 OLE
object linking and embedding
 O level
Ordinary level
 OLS
ordinary least squares
 om
Oman
 OM
Order of Merit
 OMB
Office of Management and Budget
 OMLX
London Securities and Derivatives Exchange
 OMOV
one member one vote
 OMR
optical mark reader | optical mark recognition
 ON
Old Norse | Ontario
 ONI
Office of Naval Intelligence
 o.n.o.
or near(est) offer
 ONS
Office for National Statistics
 Ont.
Ontario
 o.o.
on order
 OOD
officer of the deck
 OOG
object-oriented graphics
 OOP
object-oriented programming
 OOTB
out of the blue | out of the box
 OP
observation post | Order of Preachers | organophosphate | out of print | outpatient
 op.
opera | operation | opposite | optical | opus
 Op.
Opus
 O/P
output
 OPA
offre publique d’achat
 OPAP
Appellation of Origin of Superior Quality
 op art
optical art
 OPB
Occupational Pensions Board
 op. cit.
in the work or works quoted
 OPE
Controlled Appellation of Origin
 OPEC
Organization of Petroleum Exporting Countries
 ophthal.
ophthalmologist | ophthalmology
 ophthalmol.
ophthalmologist | ophthalmology
 OPM
other people’s money
 OPP
oriented polypropylene
 opp.
opposite
 op shop
opportunity shop
 OPT
optimized production technology
 opt.
optative | optical | optician | optics | optimum | optional
 OR
own recognizance | Official Receiver | operating room | operations (or operational) research | Oregon | other ranks | owner’s risk
 ORB
object request broker
 orch.
orchestra | orchestrated by
 ord.
order | ordinal | ordinance | ordinary | ordnance
 ordn.
ordnance
 org
noncommercial organization
 org.
organic | organization | organized
 orig.
origin | original | originally
 ornith.
ornithological | ornithology
 OROM
optical read-only memory
 ORT
oral rehydration therapy
 orth.
orthopaedic | orthopaedics
 ORV
off-road vehicle
 Os
osmium
 OS
left eye | old series | Old Style | operating system | Ordinary Seaman | Ordnance Survey | out of stock | outsize | outstanding
 o.s.
old series | out of stock | outstanding
 O/S
out of stock
 OSA
obstructive sleep apnoea | Order of Saint Augustine
 OSB
Order of Saint Benedict
 OSCE
Organization for Security and Cooperation in Europe
 OSD
Order of Saint Dominic
 OSF
Open Software Foundation | Order of Saint Francis
 OSI
open systems interconnection
 OSPF
open shortest path first
 OSU
Order of Saint Ursula
 OT
occupational therapist | occupational therapy | Old Testament | overtime
 OTC
Officers’ Training Corps | over-the-counter
 OTE
on-target earnings
 OTEC
Ocean Thermal Energy Conversion
 OTL
out to lunch
 OTO
one time only
 OTOH
on the other hand
 otol.
otology
 OTP
open trading protocol
 OTS
Officers’ Training School | opportunities to see
 OTT
over the top
 OU
Open University
 OV
overflow
 OWTTE
or words to that effect
 Oxon.
of (the University of) Oxford
 oz
Australia | ounce


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