OS
Longman Dictionary of Contemporary English OnlineLDOCE OnlineOS1 /ˌəʊ ˈes $ ˌoʊ-/ noun [countable] an operating system The new OS is considerably faster than earlier versions.OS2 /ˌəʊ ˈes/ 1. Ordnance Survey2. outsizeFrom Longman Business DictionaryOSOS (also O/S) abbreviation for OPERATING SYSTEM; OUT OF STOCK; OUTSIZE; OUTSTANDING
system Business an operating
OS
ˌOrdnance ˈSurvey, the 
abbreviation, OS
an official organization which makes very detailed and correct maps of Britain and Ireland. The maps are used by people walking in the country, and each map has its own OS number. ⇨ compare US Geological Survey
OS /ˌəʊ ˈes/ abbreviation for
1. Ordnance Survey
2. outsize
| I |
abbreviation, OSan official organization which makes very detailed and correct maps of Britain and Ireland. The maps are used by people walking in the country, and each map has its own OS number. ⇨ compare US Geological Survey
| II |
abbreviation for1. Ordnance Survey
2. outsize