Venn diagram
US /ˌven ˈdaɪ.ə.ɡræm/
UK /ˌven ˈdaɪ.ə.ɡræm/
1.
a diagram representing mathematical or logical sets pictorially as circles or other closed curves within an enclosing rectangle (the universal set), common elements of the sets being represented by the areas of overlap among the circles.
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We used a Venn diagram to illustrate the commonalities between the two groups.
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The professor drew a Venn diagram on the board to explain set theory.