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Where two items that were previously unrelated intersect they start to Venn. The amount of overlap between two items is referred to as 'Venning'.

You can illustrate this artifact at a point in time using a Venn Diagram.
For example, I recommended that the venning between the roles of a web developer and designer should be much more pronounced that what was presented by Tristan.
by Circular September 26, 2013