| Acronym | Definition |
|---|
| PAA | Pituitary Adrenal Axis |
| PAA | Port Authority Act (Pennsylvania) |
| PAA | Population Association of America (Silver Spring, Maryland) |
| PAA | Peninsula Art Academy (Peninsula, OH) |
| PAA | Plains All American Pipeline, LP (stock symbol) |
| PAA | Protect America Act of 2007 |
| PAA | Polyacrylic Acid |
| PAA | Photographers Association of America (now Professional Photographers of America) |
| PAA | Pan American Airlines (ICAO code) |
| PAA | Professional Anglers Association |
| PAA | Professional Achievement Award (various organizations) |
| PAA | Program Activity Architecture (Canada) |
| PAA | Performing Arts Academy (various organizations) |
| PAA | Performance Achievement Award |
| PAA | Public Administration Agency (Bosnia and Herzegovina) |
| PAA | Parents as Advocates |
| PAA | Palo Alto Airport (Palo Alto, CA) |
| PAA | Port Analyzer Adapter |
| PAA | Performance Assurance Agent |
| PAA | Peracetic Acid |
| PAA | Practical and Applied Arts (education) |
| PAA | Pair Availability Analysis |
| PAA | Prueba de Aptitud Académica (Spanish: Academic Aptitude Test; Chile) |
| PAA | Potato Association of America (Orono, Maine) |
| PAA | Potential Annexation Area (Washington) |
| PAA | Peroxyacetic Acid |
| PAA | Phased Adaptive Approach (US DoD) |
| PAA | Pattern Analysis and Applications |
| PAA | Pan Asian E-Commerce Alliance |
| PAA | Phased-Array Antenna |
| PAA | Pennsylvania Automotive Association (Harrisburg, Pennsylvania) |
| PAA | Purdue Alumni Association (West Lafayette, Indiana) |
| PAA | Primary Aircraft Authorized |
| PAA | Project Atmosphere Australia |
| PAA | Piezo Audio Amplifier (Sonitron) |
| PAA | Priority Area Assessment |
| PAA | Psychologists' Association of Alberta (Edmonton, Alberta, Canada) |
| PAA | Plan Administration Account |
| PAA | Policy Approving Authority |
| PAA | Pre-Accession Advisor |
| PAA | Pharmacy Alumni Association |
| PAA | Pacific Arts Association (Blaine, Washington) |
| PAA | Primary Aircraft Authorization |
| PAA | Port Analyzer Adapter (Cisco) |
| PAA | Positive Aquaculture Awareness |
| PAA | Photon Activation Analysis |
| PAA | Primary Assigned Aircraft |
| PAA | Parallel Algorithms and Architectures |
| PAA | Pasadena Athletic Association (California) |
| PAA | Pakistan Advertising Association |
| PAA | Protected Area Archive (NASA) |
| PAA | Position Area for Artillery |
| PAA | Projeto e Análise de Algoritmos |
| PAA | Presbyterians for Addiction Action |
| PAA | Procurement of Ammunition, Army |
| PAA | Pitt Alumni Association (Pittsburgh, Pennsylvania) |
| PAA | Parkview Adventist Academy (Lacombe, Alberta, Canada) |
| PAA | Polyacryl Amide |
| PAA | Principal Accrediting Authority |
| PAA | Peer Access Approval |
| PAA | Primary Aircraft Assigned |
| PAA | Protein Annotator's Assistant |
| PAA | Progressive Action Alliance (Texas) |
| PAA | Primary Aromatic Amine |
| PAA | Priority Action Agenda (Vanatau) |
| PAA | Police Administrative Aide |
| PAA | Property Accounting Activity |
| PAA | Pollution Abatement Ashore |
| PAA | Procurement Appropriation, Army |
| PAA | Pay Adjustment Authorization |
| PAA | Punahou Alumni Association (Honolulu, Hawaii) |
| PAA | Police Administrative Assistant |
| PAA | Pension Adjustment Account (Canada) |
| PAA | Professional Apparel Association (Wayne, PA) |
| PAA | Pennsylvania Aquaculture Association |
| PAA | Petroleum Aquisition Adjustment |
| PAA | Program Assistance Announcement |
| PAA | Professional Aircraft Accessories, Inc |
| PAA | Personnel Allowance Amendment |
| PAA | Prehistoric Australian Artefacts |
| PAA | Priority Abatement Area |
| PAA | Pakistan-American Association |
| PAA | Peripheral Attack Aircraft |
| PAA | Primary Assembly Area |
| PAA | Plains Apartment Association (Auburn, AL) |
| PAA | Penetrability Analysis Application |
| PAA | Programmed Aircraft Authorization |
| PAA | Purchase Accounting Adjustment |
| PAA | Personal Auto-Attendant |
| PAA | Provisioning Access Arrangement |
| PAA | Program Authorized Allowance |
| PAA | Protected Approach Alley |
| PAA | Playground Appreciation Association |
| PAA | Please Avoid Acronyms |
| PAA | Printed-Aperture Antenna |
| PAA | Protecting Adults from Abuse |
| PAA | Priorities, Allocations, and Allotments |