| DEF | DELIVERY FEE | 送货费 |
| DEF | def art definite article | (定冠)定冠词 |
| DEF | Distance Enumerator Function | 距离枚举器函数 |
| DEF | SmartWare II Data definition | SmartWare II数据定义 |
| DEF | Dose Effect Factor | 剂量效应系数 |
| DEF | Digital Enforcement Faction | 数字执法势力 |
| DEF | Defense Enterprise Fund | 国防企业基金 |
| DEF | Direct Equipment Failure | 直接设备故障 |
| DEF | Dependents Function | 从属函数 |
| DEF | Defecation | 排便 |
| DEF | Defrost | 解冻 |
| DEF | Drug Education Forum | 毒品教育论坛 |
| DEF | Definite | 一定的 |
| DEF | Defend | 防御 |
| DEF | deficiency | 缺乏 |
| DEF | Defense | 防守 |
| DEF | Detector and Extractor of Fileprints | 文件打印的检测器和提取器 |
| DEF | Definitions (File Name Extension) | 定义（文件扩展名） |
| DEF | Deficient | 缺乏的 |
| DEF | Defile | 弄脏 |
| DEF | Defaults (File Name Extension) | 默认值（文件扩展名） |
| DEF | Development and Evaluation Facility | 发展与鉴定设施 |
| DEF | Diamond Empowerment Fund | 钻石赋权基金 |
| DEF | diethyl fumarate | 富马酸二乙酯 |
| DEF | Digital Elimination Force | 数字消除力量 |
| DEF | decayed,extracted,or filed teeth | 蛀牙、拔牙或锉牙 |
| DEF | Defend(ed) | 防御（ed） |
| DEF | duck embryo fibroblast | 鸭胚成纤维细胞 |
| DEF | decayed,or filled | 腐烂或填充 |
| DEF | Delayed Ettringite Formation (concrete) | 延迟钙矾石形成（混凝土） |
| DEF | Defender | 防守者 |
| DEF | Development & Evaluation Facility | 开发和评价的设施 |
| DEF | Defeated | 打败了 |
| DEF | Deftones (band) | Deftone（频段） |
| DEF | Disarmed Enemy Forces | 解除武装的敌军 |
| DEF | Diplôme d'Etudes Françaises (French Language Diploma) | Diplôme d'Etudes Françaises (French Language Diploma) |
| DEF | dose-effect factor | 剂量效应因子 |
| DEF | Days End Farm | 天结束农场 |
| DEF | diethylformamide | 二乙基甲酰胺 |
| DEF | Geoworks Esp Assembly header file | Geoworks Esp程序集头文件 |
| DEF | dose enhancement factor | 剂量增强因子 |
| DEF | Deployment Expeditionary Force (US Army) | 部署远征军（美国陆军） |
| DEF | Danmarks Elektroniske Forskningsbibliotek | 丹麦电力公司 |
| DEF | Decayed, Extracted, and Filled Tooth | 蛀牙、拔牙和补牙 |
| DEF | Defaults - definitions | 默认值-定义 |
| DEF | Defensman/Defensmen (hockey) | Defensman / Defensmen(曲棍球) |
| DEF | Dark Elf (Everquest) | 黑暗精灵（Everquest） |
| DEF | Deferred | 推迟 |
| DEF | Design Exchange Format (Cadence) | 设计交换格式（Cadence） |
| DEF | Design Exchange Format | 设计Exchange格式 |
| DEF | Decision Education Foundation | 决策教育基金会 |
| DEF | Defense(ive) | 防御（ive） |
| DEF | TLink - WLink Linker definition file | TLink-WLink Linker定义文件 |