Radar Data Acquisition 
Radial Distribution Analysis 
Reader's Digest Association, Inc. 
Received Data Inverted 
recently detoxified alcoholics 
Recommended Daily Allowance 
recommended daily allowances 
recommended daily amount 
Recommended Daily Dietary Allowances 
Recommended Dietary Allowance 
Recommended Dietary Allowances 
Records Disposition Authority 
Reduced Diameter Array 
Redundancy analysis 
Reflectance Difference Anisotropy 
Regional Development Account 
Regional Development Agency 
Regional Development Authority 
Regional Differences Assessment 
Registered Dental Assistant 
regularized discriminant analysis 
Relational Distributed Architecture 
Relative Dentine Abrasivity 
Relative Directory Addressing 
Reliability Design Analysis 
remedial design and action 
Remote Data Access 
Remote Database Access 
Reports Data and Analyses 
Representation difference analysis