The Collaborative International Dictionary of English v.0.48:

Motion picture \Mo"tion pic"ture\
   1. A series of pictures on a strip of film, taken at regular
      intervals in rapid succession (now usually 24 frames per
      second for ordinary work) by a special camera, intended to
      capture the image of objects in motion.
      [PJC]

   2. the display of the images captured on a motion
      picture[1], presented to the eye in very rapid succession
      by projection from a special apparatus (a movie
      projector), with shows some or all of the objects in the
      picture represented in changing positions, producing, by
      persistence of vision, the optical effect of a continuous
      picture in which the objects appear to move as they did in
      the original scene.

   Syn: movie, moving picture, flick. [Webster 1913 Suppl. +PJC]

   3. The conceptual or informational content of a motion
      picture[1]; the actions or events represented in a
      motion picture[1]; the story line of a movie. "One of
      the great punch lines in motion picture history is `Round
      up the usual suspects.' from `Casablanca'." [PJC]

WordNet (r) 3.0 (2006):

motion picture
    n 1: a form of entertainment that enacts a story by sound and a
         sequence of images giving the illusion of continuous
         movement; "they went to a movie every Saturday night"; "the
         film was shot on location" [syn: movie, film,
         picture, moving picture, moving-picture show, motion
         picture, motion-picture show, picture show, pic,
         flick]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "motion picture":
   3-D, Cinemascope, Cinerama, Technicolor, Western, animated cartoon,
   black-and-white film, boom shot, cartoon, chiller, cine, cinema,
   close-up, color film, creepie, deuce shot, documentary,
   documentary film, educational film, feature, film, flick, flicker,
   follow-focus shot, full shot, group shot, horror picture,
   horse opera, kinescope, long shot, matte shot, medium shot,
   motion-picture show, movie, moving picture, newsreel, nudie,
   pan shot, panoramic shot, photodrama, photoplay, picture,
   picture show, pornographic film, preview, process shot, rap shot,
   retake, short, shot, show, silent, silent film, skin flick,
   sneak preview, spaghetti Western, take, talkie, talking picture,
   thriller, trailer, travel shot, trucking shot, underground film,
   zoom shot