Enterprise architecture is the fusion of business and technology. This is accomplished in large part through business processes analysis and reengineering or continuous process improvement, the very same techniques used in human resources, operations management, logistics and supply chain management, Six Sigma, and TQM.
The US Government defines enterprise architecture in OMB Circular A-130: "What is the Enterprise Architecture? (a) An EA is the explicit description and documentation of the current and desired relationships among business and management processes and information technology."
DODAF and derivatives include business process diagrams, and in DODAF these are labled "OV-5" or operational view number five.
TOGAF identifies "Phase B" as business architecture, including business process analysis.
"If you do anything long enough, you eventually get good at it." MK