( also three-D ) n [ U ]
( in films ) the quality of appearing to have three dimensions, i.e. depth as well as length and width. Audiences for 3-D films have to wear special glasses to get the proper effect. The process for making such films was invented in 1936 but not used by Hollywood until the 1950s. Popular 3-D films included House of Wax (1953) and Hondo (1953). Since the middle of the 1990s, many 3-D films have been produced for showing in IMAX cinemas (= a type of cinema that shows films on a very large screen).