|Noun||1.||adjacency - the attribute of being so near as to be touching|
|(networking)||adjacency - A relationship between two network devices,
e.g. routers, which are connected by one media segment so
that a packet sent by one can reach the other without going
through another network device. The concept of adjacency is
important in the exchange of routing information.|
Adjacent SNA nodes are nodes connected to a given node with no intervening nodes. In DECnet and OSI, adjacent nodes share a common segment (Ethernet, FDDI, Token Ring).