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Definition: ultra-mobile PC

(1) a very lightweight computer. See tablet and laptop.

(2) (Ultra-Mobile PC) An earlier lightweight Tablet PC. Introduced in 2006, an Ultra-Mobile PC (UMPC) weighed about two pounds and contained a hard drive for storage. It ran under the Windows Tablet PC operating system, and both Wi-Fi and Bluetooth were included. Code-named Origami, the Ultra-Mobile PC followed Microsoft's Windows CE-based media player (see Portable Media Center). See Tablet PC.

Samsung's DialKeys
Microsoft's Touch Pack let people type with their thumbs on this Samsung Q1, one of the first Ultra-Mobile PCs. (Image courtesy of Samsung Electronics Company, Ltd.)