The quality of being a neighbor, of living nearby, next to each-other; proximity.
Close proximity, nearby area; particularly, close proximity to one's home.
The inhabitants of a residential area.
A formal or informal division of a municipality or region.
An approximate amount.
The quality of physical proximity.
The disposition becoming a neighbor; neighborly kindness or good will.
Within a topological space:
Within a metric space:
The infinitesimal open set of all points that may be reached directly from a given point.
The set of all the vertices adjacent to a given vertex.