Universal Access – Enabling your website to be accessible to all, despite disabilities that users may have.
URL – A web address or location of a particular page of file online, for example http://www.jeffreydriver.co.uk.
Usability – A term referring to the ease of use of a device or user-interface.
USB – A now universal computer interface allowing a variety of devices and peripherals to be attached.
User Centered Design – This is more of a philosophy than anything else. It means to concentrate on the needs of customers/users and designing for them, not yourself.
USP – Unique Selling Point. Something which sets you apart from your competitors.