adjacency

This term describes a precise spatial or temporal relationship where two entities touch or are positioned immediately next to one another. It carries a clinical or technical tone, often used in urban planning, geography, or mathematics to describe a structural connection rather than a vague sense of proximity. In technical fields like computer science and graph theory, the word takes on a specific logical meaning. It refers to the direct connection between nodes in a network, where adjacency is a binary state—either two points are connected by an edge or they are not.