A more highly evolved internet that is data driven and flexible, relying on machines to make actions, links, and more.
From the user perspective, the Semantic Web will be a customized and personalized user experience, working with the devices that they have in a way that they wish to interact with the web.
Searches are more relevant, needs are anticipated before expressed, and filters are more effective.
Linked data, more robust machines, and better data will make this happen.
What is your definition?