| REL | reliable | 可靠的 |
| REL | Trelew, Chubut, Argentina (Airport Code) | Trelew，Chubut，阿根廷（机场代码） |
| REL | Relayer | 继电器 |
| REL | Robert Edward Lee | 罗伯特·爱德华·李 |
| REL | Richland Energy Laboratory (Tri-Cities University Center) | 里奇兰能源实验室（三城大学中心） |
| REL | Trelew, CB, Argentina | Trelew，CB，阿根廷 |
| REL | Research Enterprise Limited | 研究企业有限公司 |
| REL | related | 相关的 |
| REL | resting expiratory level | 静息呼气水平 |
| REL | rate of energy loss | 能量损失率 |
| REL | Regional Educational Laboratory | 区域教育实验室 |
| REL | relatively | 相当地 |
| REL | Authorized for Release To ... | 授权发布至。。。 |
| REL | Rosen Electronics Letter | 罗森电子信函 |
| REL | Radio Equipment List (Canada) | 无线电设备列表（加拿大） |
| REL | Relações Internacionais (Brazil) | Relações Internacionais (Brazil) |
| REL | Radio Engineering Laboratories | 无线电工程实验室 |
| REL | Reference Exposure Level | 参考暴露水平 |
| REL | Recommended exposure limit | 建议接触限值 |
| REL | Reliance Group Holdings, Inc. | 信实集团控股有限公司。 |
| REL | Recommended Exposure Limit (NIOSH) | 建议接触限值（NIOSH） |
| REL | Rights Expression Language | 权限表达语言 |
| REL | Random Even Lengths (lumber) | 随机偶数长度（木材） |
| REL | Relation | 关系 |
| REL | relay | 转发 |
| REL | Release Message | 发布消息 |
| REL | Religion | 宗教 |
| REL | Relocate | 重新安置 |
| REL | Release | 释放 |
| REL | Relief | 救济 |
| REL | Relieved | 释然的 |
| REL | Relative | 相对的 |
| REL | Release/Released | 版本/释放 |
| REL | V-Rel Avian Reticuloendotheliosis Viral Oncogene Homolog | V-Rel禽网状内皮细胞增生病毒癌基因同源性 |
| REL | Reliance Energy Ltd | 信实能源有限公司 |
| REL | Rear End Loader (waste container) | 后端装载机（废物容器） |
| REL | Ring Enhancing Lesion | 环强化损伤 |
| REL | Recovered Energy Logic | 回收能源逻辑 |