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The sense of the word "propinquity" as given here is a specialised one. For a more general definition of the word, see propinquity in the Wiktionary.

In social psychology, propinquity (from Latin propinquitas, nearness) is one of the main factors leading to interpersonal attraction. It refers to the physical or psychological proximity between people. Two people living on the same floor of a building, for example, have a higher propinquity than those living on different floors. Propinquity can mean physical proximity, a kinship between people, or a similarity in nature between things. Propinquity is also one of the factors, set out by Jeremy Bentham, used to measure the amount of pleasure in a method known as felicific calculus.

The propinquity effect is the tendency for people to form friendships or romantic relationships with those whom they encounter often. In other words, relationships tend to be formed between those who have a high propinquity. It was first theorized by psychologists Leon Festinger, Stanley Schachter, Kurt Lewin and Kurt Bach in what came to be called as the Westgate studies conducted at MIT (1950). The typical Euler diagram used to represent the propinquity effect is shown below where U = universe, A = set A, B = set B, and S = similarity:

The sets are basically any relevant subject matter about a person, or persons, or non-persons, etc; depending on the context of the use of the word. Propinquity can be more than just physical distance. Residents of an apartment building living near a stairway, as an example, tend to have more friends from other floors than others. The propinquity effect is usually explained by the mere exposure effect, which holds that the more exposure a stimulus gets, the more likeable it becomes.

• Human bonding
• Proxemics
• Westermark effect

• Festinger, L., Schachter, S., Back, K., (1950) "The Spatial Ecology of Group Formation", in L. Festinger, S. Schachter, & K. Back (eds.), Social Pressure in Informal Groups, 1950. Chapter 4.

• Propinquity Effect
• Human Mate Selection - An Exploration of Assortive Mating Preferences - (has two pages of propinquity studies)