Information Visualization Definitions

http://www.infovis-wiki.net/index.php?title=Information_Visualization

Information visualization (InfoVis)
produces (interactive) visual representations of abstract data
to reinforce human cognition and perception;
thus enabling the viewer to gain knowledge about the internal structure of the data and causal relationships in it.

Information visualization (InfoVis)
is the communication of abstract data
through the use of interactive visual interfaces.
[Keim et al., 2006]

and there are a lot more.