Source : Webster's Revised Unabridged Dictionary (1913)

Spacious \Spa"cious\, a. [L. spatiousus: cf. F. spacieux. See
   {Space}, n.]
   1. Extending far and wide; vast in extent. ``A spacious plain
      outstretched in circuit wide.'' --Milton.

   2. Inclosing an extended space; having large or ample room;
      not contracted or narrow; capacious; roomy; as, spacious
      bounds; a spacious church; a spacious hall. --
      {Spa"cious*ly}, adv. -- {Spa"cious*ness}, n.

Source : WordNet®

spacious
     adj 1: very large in expanse or scope; "a broad lawn"; "the wide
            plains"; "a spacious view"; "spacious skies" [syn: {broad},
             {wide}]
     2: (of buildings and rooms) having ample space; "a roomy but
        sparcely furnished apartment"; "a spacious ballroom" [syn:
         {roomy}]