A Latin term for a small township or village. Usually a subdivision of a major city (Ancient Rome had around 250 vici), or the settled area immediately surrounding a Roman military camp. The Roman camp at Manchester is visible as a reconstruction in the modern day city centre neighbourhood aptly named Castlefield and the area around the camp would have been used for trade between the Romans and the local population and would have been relatively densely populated.
"Vicus" is a root of the modern English "vicinity".