The meaning of the Acronym OOS is...

OOS is

• Orbit-to-Orbit Stage
• Orbit-to-Orbit Shuttle
• On-Orbit Station

More Meanings For OOS:

• Ostrich Operating System
• Object-Oriented System
• Out Of Service
• Out Of Synchronization
• Otm Overhead Signal
• Out Of Specification
• Ocean Observing System
• Optics Online Store
• Out Of Shit
• Other Orbit Senshi
• Out Of School
• Out Of Story
• Oranges Or Strawberries
• Overseas Occupational Standards
• Occupational Overuse Syndrome

OOS is also in:

• Adults
• Electronics
• General
• Ocean Science
• Physics
• Physiology
• Telecom
• Unfiled