The Collaborative International Dictionary of English v.0.48:
offset printing \off"set print"ing\, n. (Printing) A printing technique in which a lithographic image on an inked metal or stone plate is transferred first to a rubber sheet (usually on a cylinder) before transfer to the paper. Called also offset lithography. [PJC]WordNet (r) 3.0 (2006):
offset lithography n 1: offset printing by lithography