Source : Webster's Revised Unabridged Dictionary (1913)

Residential \Res`i*den""tial\ (-d?n"shal), a.
   1. Of or pertaining to a residence or residents; as,
      residential trade.

   2. Residing; residentiary. [R.]

Source : WordNet®

residential
     adj 1: used or designed for residence or limited to residences; "a
            residential hotel"; "a residential quarter"; "a
            residential college"; "residential zoning" [ant: {nonresidential}]
     2: of or relating to or connected with residence; "a
        residential requirement for the doctorate"