1) Architecture design refers to the actual design and layout of spaces.
(http://www.wisegeek.com/what-is-architecture-design.htm)
2) A concept that focuses on the components or elements of a structure or system and unifies them into a coherent and functional whole, according to a particular approach in achieving the objective(s) under the given constraints or limitations.
(http://www.businessdictionary.com/definition/architectural-design.html)
3) Architectural design is a fine arts discipline that deals with the construction, design and the function of buildings and large construction.
(http://answers.ask.com/Arts/Architecture/what_is_architectural_design)
