| Subject | English | Welsh |
| comp., MS | single click | un clic (One mouse click (usually with the left mouse button)) |
| comp., MS | Single data type | Math o ddata unigol (A data type that stores single-precision floating-point variables as 32-bit (4-byte) floating-point numbers ranging in value from -3.402823E38 to -1.401298E-45 for negative values and 1.401298E-45 to 3.402823E38 for positive values) |
| comp., MS | single-document interface | rhyngwyneb un ddogfen (A specification according to which each open document occupies its own window in the UI, though only a single instance of the program application is running) |
| comp., MS | single-mapped cell | cell wedi'i mapio'n unigol (A cell that has been linked to a non-repeating element in an XML map) |
| comp., MS | Single Payment Classification Code | Cod Dosbarthiad Un Taliad (A Standard Entry Class ACH code that describes a type of financial transaction) |
| comp., MS | single session-only disc | disg un sesiwn (A recordable media (such as CD-RW) to which you can only write once without reformatting) |
| comp., MS | single sign-on | cyflwyno'ch hun unwaith (An authentication process that permits a user to log on to a system once with a single set of credentials to access multiple applications or services) |
| comp., MS | single sign-on administrator | gweinyddwr mewngofnodi un-tro (A security principal who is authorized to change a single sign-on (SSO) configuration and obtain master secrets from a master secret server) |
| comp., MS | single sign-on identifier | dynodwr mewngofnodi un-tro (A string that represents the definition of user credentials that allow a user to access a network) |
| comp., MS | single sign-on system | system mewngofnodi un-tro (A software-based implementation that enables users to gain access to multiple resources without entering their credentials multiple times) |
| comp., MS | single sign-on ticket | tocyn mewngofnodi un-tro (A token that contains the encrypted identity of a single sign-on (SSO) user in the form of a security identifier string and a nonce) |
| comp., MS | single-threaded apartment | rhandy un trywydd (An apartment that consists of exactly one thread) |
| comp., MS | Windows 8 Single Language | Windows 8 Iaith Sengl (An edition of Windows 8 designed to make Windows affordable to mainstream consumers in emerging markets) |