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What does O/S stand for?

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Rank Abbr.Meaning
OSOperating System
OSOpen Source
OSOpen Systems
OSOn Schedule
O/SOutside
O/SOne Size
OSOld Style
OSOld School
O/Son sale
OSOnline Services
OSOne Side
OSOverall Survival
OSOn-Site
OSOff Screen (cinematography)
OSOuter Space
OSOut of Stock
O/SOperating System
OSOffice of the Secretary
OSOverseas
OSOffice Support
OSOrdnance Survey
O/SOffset
O/SOverseas
OSOmaha Steaks (meat company)
OSOld Style (or Old System; referring to Julian Calendars)
OSOrlando Sentinel (Orlando, FL newspaper)
O/SOutstanding (unpaid insurance claim)
OSOutsourcing Services
O/SOut of State
OSOutput Status
OSAustrian Airlines (IATA airline code)
OSOperational Security
OSOld Stuff :-)
OSOcean Springs (Mississippi)
OSOversize
OSOliver Stone (director)
OSOsmium
OsOrioles (Baltimore baseball team)
OSOld Spice (after shave brand)
O/SOversize (Canada Post)
OSOcean Shores (Washington)
OSOut-of-Service
OSOvershoot
OSOwen Sound (City, Canada)
OSOff Stage
osOssetian (language identifier; RFC 3066)
OSOn Scene
OSOver the Shoulder (cinematography)
OSOversold (stock market)
OSOxygen Sensor
O/SOn Scene
OSOutlaw Star (action-anime)
OSOnly Son
OSOs Giken (automotive racing parts manufacturer)
OSObservational Study
OSOrthopedic Surgeon
OSOperations Specialist (USN Rating)
OSOver Speed
OSOpen Sockets (Diablo II gaming)
OSOptical Scanning
OSOver Stock
OSOlympiska Spelen (Swedish: Olympic Games)
O/SOutstanding Shares (stock market)
OSOh Shoot (polite form)
OSOwn Ship
OSOld Saxon
OSOberseminar
OSOutdoor Skills
OSOsijek, Croatia (license plate)
O/SOperational/Support
OSOutstation
OSOrganizational Support
OSOperserv (IRC Operator Server)
OSOnboard Software
OSOcean Surveillance
OSOrdinary Seaman
OSOff Scene
OSOffice of Security
OSOffice Superintendent
OSObsidian Sanctum (World of Warcraft)
O/SOutstation
OSOrdinary Seaman (Canadian naval rank)
OSOperations Squadron
OSOrder Statistic
OSOrbital Station
OSOculus Sinister (Latin: Left Eye)
OSOffice of Systems
OSOil Separator
OSOutput Spy
OSOffice of Sustainability
OSOperating Standard
OSOperating Statement
OSOhr Somayach (school)
O/SOcean Surveillance
OSOpening Snap (mitral valve)
OSOffensive Support
OSOptical Sight
OSOuvrier Spécialisé (French: semi-skilled worker)
OSObiettivi Specifici
OSOpen Skies treaty
OSOfficer's Statement (performance evaluation)
OSObservation Squadron
OSOperational Suitability
OSOrthopterists' Society
OSObject Slice
OSOperating Strength
OSOrganized Stalking
OSOptical Silicon (semiconductor chip components)
OSOver Shield (Halo video game)
OSOvertime Scheduled
OSOblates of Wisdom
OSOperationalizing the Strategy
OSOgawa Shigeo (Engines)
OSOtm Shank Jazz Quintet (band)
OSOrganic Signal
OSOrienting Station (surveyed reference location for artillery position)
OSOrdnance Specification
OSOperational Superintendence (on overtime forms)
O/SOutlaw Shark
OSOld Silcoatian (Silcoates School, Wakefield, UK)
O/SOrganisation/Schmelt (Germany/Poland)
O/SOver Stock
OSOfficial Solicitor (UK)
OSOregon State (also seen as OSU)
OSOperations Support (various organizations)
OSOperator Services (various agencies)
OSOuabain-Sensitive
OSOughtred Society (est. 1991; slide rule collectors)
OSOur Savior
OSOxidative Stress
OSOverall Satisfaction

Note: We have 53 other definitions for O/S in our Acronym Attic