The Collaborative International Dictionary of English v.0.48:

Urbane \Ur*bane"\, a. [See Urban.]
   Courteous in manners; polite; refined; elegant.
   [1913 Webster]

WordNet (r) 3.0 (2006):

urbane
    adj 1: showing a high degree of refinement and the assurance
           that comes from wide social experience; "his polished
           manner"; "maintained an urbane tone in his letters" [syn:
           polished, refined, svelte, urbane]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "urbane":
   accommodating, affable, agreeable, amiable, appropriate, attentive,
   balanced, becoming, bland, civil, civilized, clubbable, clubbish,
   clubby, communicative, companionable, companionate, compatible,
   complaisant, congenial, considerate, courteous, decent, decorous,
   deferential, fair, felicitous, fit for society, fitting,
   fond of society, friendly, genial, genteel, graceful, gracious,
   gregarious, happy, hospitable, meet, metropolitan, obliging,
   poised, polite, proper, respectful, right, seemly, smooth,
   sociable, social, social-minded, solicitous, suitable, tactful,
   thoughtful



Hitchcock's Bible Names Dictionary (late 1800's):

Urbane, courteous