WordWeb Online

1. Nearest in space or position; immediately adjoining without intervening space
   "had adjacent rooms"
   - next, side by side
    
2. Having a common boundary or edge; abutting; touching
   - conterminous, contiguous, neighboring [US], neighbouring [Brit, Cdn]
    
3. Near or close to but not necessarily touching
   "lands adjacent to the mountains"; "New York and adjacent cities"

See also: adjacency, close, connected, near, nigh

Encyclopedia: Adjacent