Image Product Archive 
Intergovernmental Personnel Act 
International Permafrost Association 
International Phonetic Alphabet 
Independent Practice Association 
Information Processing Architecture 
Imagery Product Archive 
Individual Practice Association 
Information Processing Association 
Institute of Practitioners in Advertis… 
Institute of Public Administration 
Integrated Program Assessment 
Intermediate Power Amplifier 
International Patent Agreement 
International priority airmail 
Including Particular Average 
Independent Pilots Association 
Independent Program Assessment 
independent-pair approximation 
independent-particle approximation 
Indian Pale Ale 
Inflation-Protected Annuity 
Institute of Public Affairs 
Instrumented Production Aircraft 
Intellectual Property Attorney 
intelligence production agency 
interagency personnel agreement 
Intergovernmental Personnel Action 
Intergovernmental Personnel Agreement 
International Palaeontological Associa…