Venn diagram

[ven] Origin

Venn diagram

[ven]
noun Mathematics, Symbolic Logic.
a diagram that uses circles to represent sets and their relationships.

Origin:
1940–45; named after John Venn (1834–1923), English logician
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Venn diagram is always a great word to know.
So is real number. Does it mean:
a formula for determining additional values or derivatives of a function from the relationship of its given values
a rational number or the limit of a sequence of rational numbers, as opposed to a complex number
Collins
World English Dictionary
Venn diagram (vɛn)
 
n
maths, logic a diagram in which mathematical sets or terms of a categorial statement are represented by overlapping circles within a boundary representing the universal set, so that all possible combinations of the relevant properties are represented by the various distinct areas in the diagram
 
[C19: named after John Venn (1834--1923), English logician]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

Venn diagram
1884, named for Eng. logician John Venn (1834-1923).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Venn diagram   (věn)  Pronunciation Key 


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A diagram that uses circles to represent sets, in which the relations between the sets are indicated by the arrangement of the circles. For example, drawing one circle within another indicates that the set represented by the first circle is a subset of the second set. The Venn diagram is named after its inventor, British mathematician John Venn (1834-1923).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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