Merriam-Webster Collegiate Dictionary - dummy

 I. noun  (plural dummies)  Etymology: 1dumb + 4-y  Date: 1598  1.  a. a person who is incapable of speaking  b. a person who is habitually silent  c. a stupid person  2.  a. the exposed hand in bridge played by the declarer in addition to his own hand  b. a bridge player whose hand is a ~  3. an imitation, copy, or likeness of something used as a substitute: as  a. mannequin  b. a stuffed figure or cylindrical bag used by football players for tackling and blocking practice  c. a large puppet usually having movable features (as mouth and arms) manipulated by a ventriloquist  d. chiefly British pacifier 2  4. one seeming to act independently but in reality controlled by another  5.  a. a mock-up of a proposed publication (as a book or magazine)  b. a set of pages (as for a newspaper or magazine) with the position of text and artwork indicated for the printer  II. adjective  Date: 1846  1.  a. having the appearance of being real ; artificial ~ foods in the display case  b. existing in name only ; fictitious ~ corporations  2. apparently acting for oneself while really acting for or at the direction of another a ~ director  III. transitive verb  (dummied; ~ing)  Date: circa 1928 to make a ~ of (as a publication) — often used with up dummied up the front page