In a nutshell, enterprise visualization is about providing technical data to non-technical users. In most large enterprises there are large amounts of data that is really only available to engineers - most CAD software packages are expensive and very hard to use for people without engineering experience.
Enterprise visualization is about making that information available to everyone in an organization by providing an easy-to-use interface that allows non-technical users to view, annotate and measure a wide range of document.
Oracle's enterprise visualization product is called AutoVue - you can find more information about it at http://www.oracle.com/applications/autovue/index.html.
