From Longman Dictionary of Contemporary EnglishOSOS1 /ˌəʊ ˈes $ ˌoʊ-/ noun [countable] an operating system The new OS is considerably faster than earlier versions.OSOS2 /ˌəʊ ˈes/ 1 Ordnance Survey2 outsizeFrom Longman Business DictionaryOSOS (also O/S) abbreviation for OPERATING SYSTEM; OUT OF STOCK; OUTSIZE; OUTSTANDING
