| Subject | English | Japanese |
| gen. | n add-on | 追加額 |
| comp., MS | add-on | アドオン (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| gen. | add-on | 拡張 |
| gen. | n add-on | アドオン方式 |
| comp. | n add-on board | アドオン・ボード |
| comp. | n add-on board | アドオンボード |
| comp. | n add-on device | アドオン・デバイス |
| comp., MS | add-on device | アドオン デバイス (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| comp. | n add-on device | アドオンデバイス |
| gen. | n add-on module | アドオン・モジュール |
| gen. | n add-on module | アドオンモジュール |
| comp., MS | add-on package | アドオン パッケージ (An XML file in the addons folder of the Datastore. Add-on packages are used to deploy files or an application to a device or emulator) |
| comp. | n add-on section | アドオン・セクション |
| comp. | n add-on section | アドオンセクション |
| gen. | n add-on telephone | アドオン電話 |
| comp., MS | Mail Migration add-on | Mail Migration アドオン (A tool that allows users to upload email messages, email folders, and contacts from an email account on their PC to the cloud to facilitate access from multiple devices) |
| comp., MS | Microsoft Online Services Sign-In Add-On | Microsoft Online Services サインイン アドオン (A required update for Microsoft Online Services that updates the Microsoft Online Services ID Sign-In Assistant to work with other Office programs) |
| gen. | n obsc moving gadget on a pachinko machine designed to add excitement to play | 可動役物 |