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block diagram

noun
1.
a chart or diagram using labeled blocks connected by straight lines to represent the relationship of parts or phases, as the steps in a data-processing application.
Compare flow chart (def 2).
2.
Geology. a perspective representation of the geology of an area showing surface contours and generally including two vertical cross sections.
Origin
1920-1925
1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for block diagram

block diagram

noun
1.
a diagram showing the interconnections between the parts of an industrial process
2.
a three-dimensional drawing representing a block of the earth's crust, showing geological structure
3.
(computing) a diagram showing the interconnections between electronic components or parts of a program
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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