Acronym for Synchronized Multimedia Integration Language. A markup language that enables separate elements, including audio, video, text, and still images, to be accessed separately and then integrated and played back as a synchronized multimedia presentation. Based on XML (eXtensible Markup Language), SMIL allows Web authors to define the objects in the presentation, describe their locations onscreen, and determine when they will be played back. The language is based on statements that can be entered with a text editor and was developed under the auspices of the World Wide Web Consortium (W3C). See also markup language, XML.