The meaning of the Acronym OS is...

OS is

• Operating System
• Optimize For Size
• Open Source
• Open System

More Meanings For OS:

• Orzya Sativa
• Osmium
• Osmium
• Operating System
• Outstanding Student
• Overseas Studies
• On Sheet
• OmniSky
• Overhead Spending
• Operating Standards
• Organizational Software
• Oregon Steel Mills, Inc.
• Other Singer
• Out Sized
• Open Street

OS is also in:

• Accounting
• Botany
• Chemistry
• Electronics
• Firms
• General
• NYSE Symbols
• Positions
• Stock Exchange
• Universities