Merriam-Webster's Advanced Learner's Dictionary:
architecture
ar·chi·tec·ture /ˈɑɚkəˌtɛkʧɚ/ noun, pl -tures
1 [noncount] : the art or science of designing and creating buildings
• In college, he studied architecture.
2 [noncount] : a method or style of building
• The architecture of the building is modern.
3 [count] technical : the way in which the parts of a computer are organized
• different program architectures
- ar·chi·tec·tur·al /ˌɑɚkəˈtɛkʧərəl/ adj
• architectural blueprints/designs/drawings/plans
• an architectural detail/element/feature/style
- ar·chi·tec·tur·al·ly adv
• architecturally wonderful buildings