Three different meanings:
1)A physical, biological, psychological, or symbolic configuration or pattern of elements so unified as a whole that its properties cannot be derived from a simple summation of its parts.
http://www.thefreedictionary.com/gestalt
2) a structure, configuration, or pattern of physical, biological, or psychological phenomena so integrated as to constitute a functional unit with properties not derivable by summation of its parts.
http://www.merriam-webster.com/dictionary/gestalt
3) A configuration or pattern of elements so unified as a whole that it cannot be described merely as a sum of its parts.
http://www.audioenglish.net/dictionary/gestalt.htm
Gestalt definition related to design:
“Gestalt is a general description for the concepts that make unity and variety possible in design. It is a German word that roughly translates as “whole” or “form.” Gestalt theory is involved with visual perception and the psychology of art among other things. It is concerned with the relationship between the parts and the whole of a composition.”
http://daphne.palomar.edu/design/gestalt.html
Gestalt definition in psychology:
“Gestalt Psychology, founded by Max Wertheimer, was to some extent a rebellion against the molecularism of Wundt’s program for psychology, in sympathy with many others at the time, including William James. In fact, the word Gestalt means a unified or meaningful whole, which was to be the focus of psychological study instead.”
http://webspace.ship.edu/cgboer/gestalt.html

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