Abbreviation : OS

[Definition]:
Operating System

[Example Phrases]:
• Chrome OS
• Mac OS
• OS X 10
• mobile OS
• Firefox OS
• the new OS
• Android OS
• version of OS
• Windows OS
• OS X Screenshot
• iOS and OS X accessibility
• free OS
• the Android OS
• desktop OS
• smartphone OS
• free OS X apps
• Apple OS
• Windows Phone OS
• BlackBerry OS
• Linux OS
• keyboard shortcuts in OS
• OS platform
• Safari on Mac OS
• Apple Mac OS