Mashup
A mashup is an application or web site that offers content from a number of sources and combines it in one place, giving the user a way of accessing all information without having to visit different applications or web sites. An example of this would be a combination of news feeds on a number of news sites (such as AP, CNN, ABC, and others) that are accessible on one web site, keeping the user from needing to visit all of those news sites to get the headlines.
Additional Information
Also see: Internet definitions, Portal