connection

[OED]: 1. a. The action of connecting or joining together; the condition of being connected (conjoined, fastened or linked) or joined together; 3. The condition of being related to something else by a bond of interdependence, causality, logical sequence, coherence, or the like; relation between things one of which is bound up with, or involved in, another.

connectivity

in
Source: 
Kaufman (2004)
At the location where one (object) touches another the property of connectivity is exhibited. (p 174)
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