WordNet
n. the branch of architecture dealing with the arrangement of land and buildings for human use and enjoyment
Wikipedia
Landscape architecture is the design of outdoor public areas, landmarks, and structures to achieve environmental, social-behavioral, or aesthetic outcomes. It involves the systematic investigation of existing social, ecological, and soil conditions and processes in the landscape, and the design of interventions that will produce the desired outcome. The scope of the profession includes landscape design; site planning; stormwater management; environmental restoration; parks and recreation planning; visual resource management; green infrastructure planning and provision; and private estate and residence landscape master planning and design; all at varying scales of design, planning and management. A practitioner in the profession of landscape architecture is called a landscape architect.
Usage examples of "landscape architecture".
If we had thought of the full implications of the category 'Landscape Architecture' rather than dismissing it as a euphemism for gardening, we'd have seen it long before.
He was getting a degree in landscape architecture from SUNY's forestry school, which, like a dependent little sister, shared buildings and grounds with Syracuse.