Define: Architectural Design

Architecture:
-The art and science of designing and erecting buildings and other physical structures.
-A style and method of design and construction of buildings and other physical structures.

-The character or style of building: the architecture of Paris; Romanesque architecture.

Sources:
http://en.wikipedia.org/wiki/Architecture
http://www.businessdictionary.com/definition/architectural-design.html
http://dictionary.reference.com/browse/architecture


Design:
-Informally refers to a plan or convention for the construction of an object or a system (as in architectural blueprints, engineering drawing, business process, circuit diagrams and sewing patterns) while “to design” (verb) refers to making this plan.
-To create or execute in an artistic or highly skilled manner.
-To prepare the preliminary sketch or the plans for (a work to be executed), especially to plan the form and structure of: to design a new bridge.
-A graphic representation, especially a detailed plan for construction or manufacture.

Sources:
http://en.wikipedia.org/wiki/Design
http://www.answers.com/topic/design
http://dictionary.reference.com/browse/design
http://www.thefreedictionary.com/design

Architectural Design:
-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. See also behavioral design.


Conclusion:
Architectural design is basically an artistic way to design/construct buildings.