noun
The residential area near 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.
(chiefly obsolete) The quality of being a neighbor, of living nearby, next to each other; proximity.
(dated) Close proximity; nearness.
(obsolete) The disposition becoming a neighbor; neighborly kindness or good will.
(topology) Within a topological space:
(topology) Within a metric space:
(topology) The infinitesimal open set of all points that may be reached directly from a given point.
(graph theory) The set of all the vertices adjacent to a given vertex.