We’ve started a series on the SAP User Experience Community (http://experience.sap.com) which defines design and user experience terms in 500 words or less. So far we’ve covered: design, design thinking, usability testing, accessibility, and user experience.
Definitions of visual design, usability, interaction design, gamification, and mobile design are in the works!
Check out what we’ve posted so far and let us know what you think! Also, let us know what other terms you would like defined.