The on-line GIS Dictionary Web site is maintained by the Association for Geographic Information and the University of Edinburgh Department of Geography. The database contains definitions for nearly one thousand terms related to Geographic Information Systems (GIS).  Visit the Dictionary at:

http://www.geo.ed.ac.uk/agidict/welcome.html.

This dictionary provides a simple way to search or browse terms and acronyms related to GIS.  Brief descriptions and references as well as a related terms link for additional information make this a useful site.