Source : Webster's Revised Unabridged Dictionary (1913)

Stationery \Sta"tion*er*y\, n.
   The articles usually sold by stationers, as paper, pens, ink,
   quills, blank books, etc.

Stationery \Sta"tion*er*y\, a.
   Belonging to, or sold by, a stationer.

Source : WordNet®

stationery
     n : paper cut to an appropriate size for writing letters;
         usually with matching envelopes [syn: {letter paper}]