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What does RO stand for?

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Rank Abbr.Meaning
RORun on (proofreading)
RORoyal Oak (Michigan City, MI, USA)
RORule Out
RORovigo (Italy)
RORondônia (Brazilian state)
RORoom Only (hotel)
RORuimtelijke Ordening (Dutch: spatial development)
RORussian Orthodox
ROTarom Romanian Air Transport (IATA airline code)
RORecherche Opérationnelle (French: Operations Research)
ROReceive Only
RORoyal Observatory
RORange Only (sonobuoy, AN/SSQ-47)
RORégime Obligatoire (French: Required Plan; health care)
RORegional Operation (various organizations)
RORotate Out (Hyper Logo Turtle Graphics command)
RORegrets Only (invitation response)
RORéponse Objective (French)
RORegistered Optician
ROReportable Occurrence
ROResistive Open
RORouting Organisation
ROReport Orderly
ROUS Revenue Private Die Proprietary (Scott Catalogue prefix; philately)
RORutas Orientales (Spanish: Eastern Routes)
RORegistered Owner
RORegistration Officer
RORegnum Online (video game)
RORough Opening (construction)
RORoute Order
RORoutine Order (Canadian Military)
RORouting Office (US Navy)
ROResponsible Officer
RORestraining Order
RORestriction Orifice (device used to drop pressure in a pipe)
RORetired Officer (UK)
RORevenue Officer
RORevenue Outturn (UK)
ROReverse Order
ROReverse Osmosis
ROReviewing Official
RORide-On (Montgomery County, Maryland transit provider)
RORight On
RORight Outboard
RORisk Officer
RORobust Optimization
RORock Opera
RORollover (financial)
ROReporting Officer
RORequest Order
RORequested Off (work schedule)
RORequired One-Time
RORequirements Objective
RORequirements Officer
RORequisitioning Objective
RORescue Officer
ROResearch Objective
ROResearch Only
ROReserve Officer
ROResidence Order
ROResident Office
RORelay Operator
ROReliability of Operations
RORemains Open
RORemote Office
RORemote Operations
RORemoval of (medical)
RORenewables Obligation (UK)
ROReorder (proofreading)
RORepair Order
RORegional Office
ROReceptor Occupancy (pharmacology)
RORecord Only
RORed Orchestra (computer game)
RORedistribution Order
RORanking Officer
RORaphe Obscurus
RORate Offset
ROReactor Operator
RORead Only
RORadar Operator
RORadiation Oncologist
RORadio Operator
RORadiological Officer
RORagnarok Online (computer game)

Note: We have 42 other definitions for RO in our Acronym Attic

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