The Collaborative International Dictionary of English v.0.48:

Urban \Ur"ban\, a. [L. urbanus belonging to the ?ity or town,
   refined, polished, fr. urbs, urbis, a city: cf. F. urbain.
   Cf. Urbane.]
   [1913 Webster]
   1. Of or belonging to a city or town; as, an urban
      population.
      [1913 Webster]

   2. Belonging to, or suiting, those living in a city;
      cultivated; polite; urbane; as, urban manners.
      [1913 Webster]

   Urban servitude. See Predial servitude, under
      Servitude.
      [1913 Webster]

WordNet (r) 3.0 (2006):

urban
    adj 1: relating to or concerned with a city or densely populated
           area; "urban sociology"; "urban development"
    2: located in or characteristic of a city or city life; "urban
       property owners"; "urban affairs"; "urban manners" [ant:
       rural]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

URBAN. Relating to a city; but in a more general sense it signifies relating
to houses.
     2. It is used in this latter sense in the civil code of Louisiana,
articles 706 and 707. All servitudes are established either for the use of
houses or for the use of lands. Those of the first kind are called urban
servitudes, whether the buildings to which they are due be situated in the
city or in the country. Those of the second kind are called rural
servitudes.
     3. The principal kinds of urban servitudes are the following: the right
of support; that of drip; that of drain, or of preventing the drain, that of
view or of lights, or of preventing the view or lights from being
obstructed: that of raising buildings or walls, or of preventing them from
being raised that of passage and that of drawing water. Vide 3 Toull. p.
441; Poth. Introd. au tit. 13 de la Coutume d'Orleans, n. 2; Introd. Id. n.
2.