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Synonyms for Proximity (same or very similar meaning)

WordNet sense 1 (a Gestalt principle of organization holding that (other things being equal) objects or events that are near to one another (in space or time) are perceived as belonging together as a unit):
law of proximity

WordNet sense 2 (the property of being close together):
propinquity


From the ODE community, based on WordNetadd/edit