| Subject | English | Japanese |
| comp., MS | Extensible Firmware Interface | 拡張ファームウェア インターフェイス (A type of interface between a computer, firmware, hardware, and the operating system. EFI defines a new partition style called GUID partition table (GPT). EFI serves the same purpose as the basic input/output system (BIOS) found in most x86-based computers) |
| comp., MS | Extensible Firmware Interface system partition | 拡張ファームウェア インターフェイス システム パーティション (A small portion on a GUID partition table (GPT) disk that is formatted with the file allocation table (FAT) file system and contains the files necessary to start the computer and pass execution to an operating system which resides on another partition) |
| comp., MS | Extensible Markup Language | 拡張マークアップ言語 (A markup language for describing and exchanging structured data in a format that is independent of operating systems and applications. XML is a World Wide Web Consortium (W3C) specification and is a subset of Standard Generalized Markup Language (SGML)) |
| comp. | n extensible markup language | ＸＭＬ |
| comp., MS | Extensible Stylesheet Language | 拡張スタイルシート言語 (An XML vocabulary that is used to transform XML data to another form, such as HTML, by means of a style sheet that defines presentation rules) |
| comp., MS | Hyper-V Extensible Switch | Hyper-V 拡張可能スイッチ (A feature that provides extensibility capabilities to the virtual switch. It enables independent software vendors (ISVs) to create extensible plug-ins (known as Virtual Switch Extensions) that can provide enhanced networking and security capabilities) |