What is Architectural Design?

Definition 1
Architectural Design is problem solving by designing to solve a problem.
Architecture that doesn’t solve a problem, such as not fulfilling the intended program of the building, becomes art. If people can’t use the building, then what problem was solved
Source: http://bluearchitecture.wordpress.com/2011/06/18/what-is-
architectural-design/
http://www.cnvrgnc.com/storage/design-is-a-behaviour.jpg?__SQUARESPACE_CACHEVERSION=1258905942194

Definition 2

Architecture design also refers to the actual design and layout of spaces. Architecture encompasses many different elements including construction, design, and the manipulation of light as it relates to shadow. 
Source: http://www.wisegeek.com/what-is-architecture-design.htm


Definition 3
 A graphic representation, especially a detailed plan for construction or manufacture.
Source:http://www.thefreedictionary.com/design