The Collaborative International Dictionary of English v.0.48:

Letterpress \Let"ter*press`\ (-t[~e]r*pr[e^]s`), n.
   Print; letters and words impressed on paper or other material
   by types; -- often used of the reading matter in distinction
   from the illustrations.
   [1913 Webster]

         Letterpress printing, printing directly from type, in
         distinction from printing from plates.
   [1913 Webster]

WordNet (r) 3.0 (2006):

letterpress
    n 1: printing from a plate with raised characters [syn: relief
         printing, letterpress]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "letterpress":
   advance sheets, advertising matter, albertype, book printing,
   chromotypography, chromotypy, chromoxylography, collotype,
   color printing, electronography, electrostatic printing,
   graphic arts, gravure, halftone engraving, history of printing,
   impress, impression, imprint, job printing,
   letterpress photoengraving, line engraving, lithography,
   lithogravure, lithophotogravure, mackle, mimeograph, offcut,
   offprint, offset, offset lithography, onset, palaeotypography,
   photo-offset, photochemical process, photoengraving,
   photogelatin process, photographic reproduction, photography,
   photolithography, phototypography, phototypy, photozincography,
   planographic printing, planography, print, printed matter,
   printing, printmaking, publication, publishing, reading matter,
   reissue, relief printing, reprint, rotary photogravure,
   rotogravure, setoff, sheetwork, stamp, stencil, text,
   three-color printing, two-color printing, typography,
   typolithography, wood-block printing, xerography, xeroprinting,
   xylotypography, zincography