Cŏn'/ti-gŭ'/i-ty, n.

n. [L. Lat. contiguitas, Fr. contiguïté, It. contiguità, Sp. contigüedad.] The state of being in actual or close contact; approximation.

To me there appear only three principles of connection among ideas, namely, resemblance, contiguity in time or place, and cause or effect. Hume.