Multiplex/ˈmʌltɪpleks/ Definition 1 of 4Pro Tip 1/3Entertainment Venue Refers to a large cinema with multiple screens, not just any theater. The multiplex downtown has ten screens. Pro Tip 2/3Modern Cinemas Used for modern cinema complexes, not old or single-screen theaters. Older theaters are giving way to large multiplexes. Pro Tip 3/3Leisure Activity Commonly associated with social or family outings. Going to the multiplex is our favorite weekend activity.