| PAI | Polyamide-imide | 聚酰胺-酰亚胺 |
| PAI | Pulse Air Injection | （排气负压）脉冲空气喷射 |
| PAI | Passengers Association of India | 印度旅客协会 |
| PAI | Pancreatitis Association International | 国际胰腺炎协会 |
| PAI | Pathology Associates International (SAIC subsidiary) | 病理学协会国际（SAIC子公司） |
| PAI | Processed Apples Institute | 加工苹果协会 |
| PAI | Panduit Authorized Installer | Panduit授权安装人员 |
| PAI | pubic arch interference | 耻骨弓干扰 |
| PAI | Pure Active Ingredient (EPA) | 纯活性成分（EPA） |
| PAI | Physics Applications, Inc. | 物理应用公司。 |
| PAI | Police Accident Investigator | 警察事故调查员 |
| PAI | Primary Aircraft Inventory | 主要飞机库存 |
| PAI | Party for African Independence (Burkina Faso) | 非洲独立党（布基纳法索） |
| PAI | Personal Appearance Inspection (USAF Academy) | 个人外观检查（美国空军学院） |
| PAI | Pervasive Artificial Intelligence | 普适人工智能 |
| PAI | Population Action International | 国际人口行动 |
| PAI | Product Acquisition and Installation | 产品获取和安装 |
| PAI | Plasminogen Activator Inhibitor | 纤溶酶原激活物抑制剂 |
| PAI | Pathogenicity Island | 致病性岛 |
| PAI | Personal Accident Insurance | 人身意外保险 |
| PAI | Project AI (Microsoft Flight Simulator) | AI项目（微软飞行模拟器） |
| PAI | Principal Arterial-Interstate | 主动脉州际 |
| PAI | precise angle indicator | 精密角度指示器 |
| PAI | phagocytosis activity index | 吞噬活性指数 |
| PAI | porcine intestinal adenomatosis | 猪肠道腺瘤病 |
| PAI | parathyroid activity index | 甲状旁腺活动指数 |
| PAI | Propaganda And Information | 宣传和信息 |
| PAI | Public Access Initiative | 公共访问计划 |
| PAI | Piedmont Associated Industries | 皮埃蒙特联合工业公司 |
| PAI | Public Affairs Internal | 内部公共事务 |
| PAI | Parrish Associates, Inc. | Parrish Associates公司。 |
| PAI | Plans, Analysis, and Integration directorate | 计划、分析和集成董事会 |
| PAI | Photographers, Artists, and Illustrators | 摄影师、艺术家和插画师 |
| PAI | Pacific American Income Shares, Inc. | 太平洋美洲收益股份有限公司。 |
| PAI | Plant Area Index | 厂区指数 |
| PAI | Pailin, Cambodia | 柬埔寨Pailin |
| PAI | Post Acquisition Integration | 收购后整合 |
| PAI | Personnel Asset Inventory | 人员资产库存 |
| PAI | Personality Assessment Inventory | 个性评估量表 |
| PAI | Product Authentication International (UK) | 产品认证国际（英国） |
| PAI | Performance Audit Inspection | 绩效审计检查 |
| PAI | Payload Analytical Integration | 有效载荷分析集成 |
| PAI | Poverty Alleviation Initiative | 减贫倡议 |
| PAI | Pacific Achievement International | 太平洋成就国际 |
| PAI | Protection and Advocacy Inc. | 保护与倡导公司。 |
| PAI | Pre-Arrival Instruction (emergency dispatch) | 到达前指示（紧急调度） |
| PAI | Pesticide Active Ingredient | 农药活性成分 |
| PAI | Patient Assessment Instrument | 患者评估仪器 |
| PAI | Pre-Approval Inspection (FDA) | 预批准检查（FDA） |
| PAI | Process After Input | 输入后处理 |
| PAI | Polizia dell'Africa Italiana (Italian African Police) | Polizia戴尔'Africa Italiana(意大利非洲警察) |
| PAI | Protection & Advocacy, Inc. | 保护和宣传,公司 |
| PAI | percentage adherence inhibition | 粘附抑制百分比 |