Oppidan is a term used to describe an URBAN area or CIVIC center that is densely populated and has a large number of buildings. It is usually associated with a city or town, and is often characterized by a high level of commercial activity. Oppidans are typically found in areas with a high population density, such as cities and towns. They are also known for their high levels of CIVIC engagement, as they are often home to a variety of businesses, services, and cultural activities.