WordWeb Online

1. Very close or connected in space or time
   "contiguous events"
   - immediate
    
2. Connecting without a break; within a common boundary
   "the contiguous 48 states"
   - conterminous
    
3. Having a common boundary or edge; abutting; touching
   "Utah and the contiguous state of Idaho"
   - adjacent, conterminous, neighboring [US], neighbouring [Brit, Cdn]

See also: close, connected, contiguousness

Encyclopedia: Contiguous