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Acronyms and abbreviations in English.

An acronym is a word or name formed as an abbreviation from the initial components of a phrase or a word, usually individual letters. There are no universal standards for the multiple names for such abbreviations or for their orthographic styling.


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There are 141 terms in this directory beginning with the letter O.
O
Over (to you)

O.T.
Old Testament

O&O
Over and Out

O2L
1. Oxygen level in spacecraft, spacelab.
2. On to London.

OA
Ordered Aggregate

OADA
order-of-acquisition diffusion analysis

OAE
Ocean Anoxic Events

OAR
Association of Automakers (Russia)

OASIS
Organisation for the Advancement of Structured Information Standards

OATUS
On A Totally Unrelated Subject

OAUS
1. On An Unrelated Subject.
2. On a Related Subject.

OB
Obligatory (frequently Ob)

OBD
On Board Diagnostic

OBE
On-Board Equipment

obj.
object

OBL
Outbound Link

obl.
oblique

OBRPO
Polish Tyre Industry R&D Centre

obs.
observed

Obs., obs.
obsolete

Obstetr.
(in titles) Obstetric

OBTW
Oh, By the Way

OCC
Oil Corrugated Containers

occas.
occasionally

OCE
Off Cycle Emissions

OCLC
Online Computer Library Cent?r

OCP
Optimised Contact Path

OCR
1. Office of Crashworthiness Research (USA).
2. optical character recognition.

OCRS
Operator Compliance Risk Score

OCWS
Office of Crashworthiness Standards (USA)

OCXO
Oven-Controlled Crystal Oscillator

OD
1. Over Dose.
2. Oh Dear.
3. Omni-Directional.

ODA
Overseas Development Administration

ODB
Offset Deformable Barrier

ODETTE
Organization for Data Exchange by Tele-Transmission in Europe

ODI
Office of Defects Investigation (USA)

ODLIS
Online Dictionary for Library and Information Science

ODP
Open Direcrory Project

ODPM
Office of the Deputy Prime Minister

OE
Operator Error

OE.
Old English (= Anglo-Saxon)

OECD
Organisation for Economic Cooperation and Development

OEM
Original Equipment Manufacturer

OEME
Oil Energy and the Middle East (Princeton University)

OES
Occupational Exposure Standard

OF., OFr.
Old French

OFFER
(Office of Electricity Regulation) now OFGEM

OFGEM
Office for Gas & Electricity Markets (Formerly Offer and of Gas)

OFris.
Old Frisian

OFS
One Finger Salute (Usually the middle one)

OFT
Office of Fair Trading

OFTP
Odette File Transfer Protocol

Og
Organicly Grown

OGC
Office of Government Commerce

OH
Off Hand

OHG.
Old High German

OHIM
Office for Harmonisation in the Internal Market

OHS
Occupational Health & Safety

OIC
Oh, I see(C)

OIr.
Old Irish

OJ
Official Journal (EU publication)

OJEC
Official Journal of the European Community

OKC
Oliver Kevin Clark

OLAS
On-Line Access System of MVRIS

OLPA
Office of Legislative and Public Affairs (National Science Foundation)

OM
1. Oman.
2. old man.
3. Operations Manual.

OMB
office of Management & Budget (White House USA)

OMFG
Oh My fucking God!

OMG
1. Oh My God!.
2. Oh My Gandhi.

OMIM
Online Mendelian Inheritance in Man

ON.
Old Norse

ONF.
Old Northern French

ONNA
Oh No, Not Again

ONNTA
Oh No, Not This Again

OO
Overand Out

OOP
Out of Position

OOPT
1. Out of Programme Training.
2. Oxford Online Placement Test.

OOS
Official Observer Station

OOSOOM
Out Of Sight, Out Of Mind

OOTB
Out Of The Box

OOTC
Obligatory On Topic Comment

OOTF
Office of the Future (UNC)

Ophthalm.
in Ophthalmology

OPL
Obvious Panty Line

opp.
opposed (to), the opposite (of)

OPPF
Oxford Protein Production Facility

OPRA
Operator and Risk Appraisal (Risk Baserd Regulation by EA)

OPRAF
office of Passenger Rail Franchising

Opt.
in Optics

OPTL
One Person Test Lane

ORC
Osaka Resort City

ORD
Chicago OHare International Airport, Chicago, Illinois.USA.

Org.
(in titles) Organic

orig.
origin, -al, -ally

ORN
ONTANAGON Radio Network

Ornith.
(as label) in Ornithology; (in titles) Ornithology, -ical

ORR
Office of the Rail Regulator

OS.
Old Saxon

OSC
Oxygen Storage Capacity

OSCAR
Orbital Satellite Carrying Amateur Radio

OSCM
Operations and Supply Chain Management

OSD
Automotive Manufacturers Association (Turkey)

OSHA
Occupant Safety and Health Administration

OSI
Open Systems Interconnection

OSIM
Oh Shoot Ist Monday

OSl.
Old (Church) Slavonic

OSPF
Open Shortest Path First

OSS
One-Stop Service

OST
Office of Science & Technology

OSU
Officially Sanctioned User

OT
Oxytocin

OT1H
On The One Hand

OTA
Operation of EEC Type Approval

OTAQ
office of Transportation and Air Quality

OTC
Over The Counter

OTD
Out The Door

OTF
On The Floor

OTFM
Only the Facts, Mam

OTIF
1. Organisation for International Railway Traffic.
2. Open Tool Integration Framework.

OTL
Out To Lunch

OTOH
1. On The Other Hand.
2. On The One Hand.

OTOOH
On The Other Other Hand

OTP
Overview of the Process

OTR
1. Ozone Transport Region (USA).
2. Off The Record.

OTS
On The Spot

OTT
Over The Top

OTTH
On The Third Hand

OTTOMH
Off The Top Of My Head

OTTOMHAROOB
Off the Top of My Head and Rolling Out of Bounds

OTW
On The Whole

OUAT
Orissa University of Agriculture & Technology

Outl.
(in titles) Outline

OVC
Off Veihcle Charging

OVLS
Open Protocols for Interfacing Vehicle Location Subsystems

OVSC
Office of Vehicle Safety Compliance

OW
1. Oh Well.
2. Old World.

OWBL
One Way Back Link

OWTTE
Or Words To That Effect

Oxf.
(in titles) Oxford

OYIT
Oh Yes It Is

OYOFE
Or Your Other Favorite Editor

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