The Collaborative International Dictionary of English v.0.48:

Caxton \Cax"ton\, n. (Bibliog.)
   Any book printed by William Caxton, the first English
   printer. --Hansard.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Caxton
    n 1: English printer who in 1474 printed the first book in
         English (1422-1491) [syn: Caxton, William Caxton]