| Subject | Welsh | English |
| comp., MS | Ffeil diffiniadau cydnawsedd Office | Office compatibility definition file (A file that stores information about compatibility issues and workarounds and makes it available to the Office Telemetry Log and Office Telemetry Dashboard) |
| comp., MS | swigen siarad diffiniadau | definitions callout (A callout that is invoked through contextual UI to display reference data, such as definitions and synonyms, for the word selected) |