The meaning of the Acronym OA is...

OA is

• Operations Agreement
• Overall
• Output Axis
• Orbital Assembly
• Operational Instrumentation MDM-Aft
• Operational Aft (DSC or MOM)
• Office of Applications (now OSTA)

More Meanings For OA:

• Organic Acid
• Orthogonal Array
• Office of Administration
• Overzealous Academy
• Outreach and Admissions
• Oriental Adventures
• Olympic Airways
• Operations Assistant
• Offer Accepted
• Operation Administrations
• Office of Audit
• Over Actor
• Overeaters Anonymous
• Over Acting
• Order of the Arrow

OA is also in:

• Educational
• Electronics
• Firms
• Mathematics
• Media
• Non-Profit Organizations
• Ocean Science
• Performing Arts
• Positions
• Scouting
• Universities