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What does R/O stand for?

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Rank Abbr.Meaning
RORun on (proofreading)
R/ORole Of (casting/acting)
RORoyal Oak (Michigan City, MI, USA)
RORule Out
R/ORemoval Of
RORovigo (Italy)
R/ORead Only
RORondônia (Brazilian state)
R/OReverse Osmosis
R/ORegistered Office (UK)
R/OResident Of
R/ORule Out
RORoom Only (hotel)
RORuimtelijke Ordening (Dutch: spatial development)
RORussian Orthodox
ROTarom Romanian Air Transport (IATA airline code)
RORecherche Opérationnelle (French: Operations Research)
ROReceive Only
R/ORadio Operator
RORoyal Observatory
R/OReceive Only
RORange Only (sonobuoy, AN/SSQ-47)
RORégime Obligatoire (French: Required Plan; health care)
R/ORough Opening
R/OReporting Officer
RORegional Operation (various organizations)
RORotate Out (Hyper Logo Turtle Graphics command)
R/ORouting Order (freight)
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)
RORegional Office
RORough Opening (construction)
RORoute Order
RORoutine Order (Canadian Military)
RORouting Office (US Navy)
RORutas Orientales (Spanish: Eastern Routes)
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
RORegistered Owner
RORegistration Officer
RORegnum Online (video game)
RORecognized Organization (various countries)
RORecord Only
RORed Orchestra (computer game)
RORedistribution Order
ROReceptor Occupancy (pharmacology)
RORanking Officer
RORaphe Obscurus
RORate Offset
ROReactor Operator
RORead Only
R/ORequest Off
R/ORinse Off
R/ORisk Opportunity
RORadar Operator
RORadiation Oncologist
RORadio Operator
RORadiological Officer
RORagnarok Online (computer game)
R/ORange/Oven (appliance)
R/ORelationship Officer
R/ORepair Order

Note: We have 42 other definitions for R/O in our Acronym Attic

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