The meaning of the Acronym OS is...

OS is

• Outer Space
• Orbiter CEI Specification
• Orbital Servicing
• Optics Subsystem
• Operating System
• Operating Software
• On-Orbit Station

More Meanings For OS:

• Operating System
• Operating System
• Optimize For Size
• Open Source
• Open System
• Overhead Sending
• Online Services
• Open Server
• Operating System
• Open Source
• Open Sockets
• Operating System
• Operations System
• Orzya Sativa
• Osmium

OS is also in:

• Botany
• Chemistry
• Drivers
• General
• Networking
• Security
• Software
• Telecom