O/S


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AcronymDefinition
O/SOperating System
O/SOutside
O/SOne Size
O/Son sale
O/SOffset
O/SOverseas
O/SOutstanding (unpaid insurance claim)
O/SOut of State
O/SOversize (Canada Post)
O/SOn Scene
O/SOutstanding Shares (stock market)
O/SOperational/Support
O/SOutstation
O/SOcean Surveillance
O/SOutlaw Shark
O/SOrganisation/Schmelt (Germany/Poland)