Definition of Fat client:
A computer setup where the server is not dependent upon the computers applications or programs. A fat client setup allows the computer to perform many of its functions without connecting to the network server every time. Fat clients keep costs down by reducing the server load, and are also beneficial for users who want to run very intensive programs such as video games. See also thin client.
(In a client-server network) a client terminal with significant processing capacity, on which system applications may be stored and run, specifically one with a hard disk.
Meaning of Fat client & Fat client Definition