| adjective | nearest in space or position; immediately adjoining without intervening space “had adjacent rooms” |
| adjective | having a common boundary or edge; abutting; touching “Rhode Island has two bordering states; Massachusetts and Conncecticut” |
| adjective | near or close to but not necessarily touching “lands adjacent to the mountains” |
| adjacency | noun | the attribute of being so near as to be touching |
| contiguousness | noun | the attribute of being so near as to be touching |
| contiguity | noun | the attribute of being so near as to be touching |