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Contiguity is a series of things in continuous connection, a grouping of parts in contiguous physical contact. ^[1] The concept was first set out in the Law of Contiguity, one of Aristotle's Laws of Association, which states that things which occur in proximity to each other in time or space are readily associated.

A cluster of genes that are located close to one another at a chromosome locus. Contiguous gene disorders result from deletions or duplications of a chromosome segment, thus causing a contiguous gene imbalance.

Elements of memory are contiguous if they appear to be or are, adjacent, or connected to, one another.

Lands which are in physical contact with one another. In the United States, for example, the "48 contiguous states" exclude the states of Hawaii and Alaska, which are not of one piece with the mainland. ^[2]

Two or more contiguous municipalities can be consolidated into one, or one municipality can consist of many noncontiguous elements. For example, the Financially Distressed Municipalities Act allows the state of Pennsylvania to merge contiguous municipalities to reduce financial distress.

Geographic contiguity is important in biology, especially animal ranges. For a particular species, its habitat may be a 'contiguous range', or it might be broken, requiring periodic, typically seasonal migrations. The same concept of contiguous range is true for human transportation studies in an attempt to understand census geography. ^[3] It also comes into play with electoral geography and politics. ^[4]

Contiguity is a metallurgical property used to characterize microstructure of materials. It is computed by finding the ratio of solid-solid length to the sum of solid-solid and solid-liquid length of the microstructure.

Association by contiguity is the principle that ideas, memories, and experiences are linked when one is frequently experienced with the other. For example, if you constantly see a knife and a fork together they become linked (associated). The more these two items (stimuli) are perceived together the stronger the link between them. When one of the memories becomes activated later on, the linked (contiguously associated) memory becomes temporarily more activated and thus easier to be called into working memory. This process is known as priming, and the initial memory that primed the other is known as the retrieval cue.

Association by contiguity is the root of association by similarity. Association by similarity is the idea that one memory primes another through their common property or properties. Thus, an apple may prime a memory of a rose through the common property of red. These two become associated even though you may have never experienced an apple and a rose together (consistent with association by contiguity).

When one associated memory, a group of associated memories, or a whole line of associated memories becomes primed, this is known as spreading activation.

In conditioning, contiguity refers to how associated a reinforcer is with behaviour. The higher the contiguity between events the greater the strength of the behavioural relationship.

Edwin Ray Guthrie's contiguity theory deals with patterned movements. ^[5]