operational availability date 
Overseas Arrivals and Departures 
Operational Availability Data 
Optical Admittance Diagram 
Orbital Attitude Display 
Ordered to Active Duty 
Object Analysis and Design 
Objective Architecture Document 
obliterative airway disease 
obliterative airways disease 
obscure auditory dysfunction 
obstructive airway disease 
obstructive airways disease 
occlusive arterial disease 
octanamide 
October AUSA Demonstration 
off-axis distance 
One Atom Detection 
Open Architecture Driver 
Operational Active Date 
Operations Analysis Division 
Optical Activity Detector 
Option Adjusted Duration 
ORBIT AND ATTITUDE DETERMINATION 
ordnance available date 
Oregon Association of the Deaf 
Origination-Address Display 
Orscom Tourist Installations Company 
Orthogonal array design 
osteoarthrosis deformans