1. The art or science of building or constructing edifices of any kind for human use: Regarded in the wide application, architecture is divided into civil, ecclesiastical, naval, and military. They deal respectively with houses and other buildings (such as bridges) of ordinary utility, churches, ships, and fortification

Architecture is sometimes regarded solely as a fine art.
2. The design or structure of a system or method: The improved architecture of the firm will certainly improve the working conditions of the employees and save money at the same time.
3. The special method or "style" in accordance with which the details of the structure and ornamentation of a building are arranged: Mrs. Marshall was very interested in Gothic architecture and visited many old churches in Europe.
4. The conceptual structure and overall logical organization of a computer or computer-based system from the point of view of its use or design: Mr. Hoover didn't like the architecture of his computer, so he bought another one which was more compatible to his needs.