Open English Wordnet
Adjectives
(s)adjacent, next, side by sidenearest in space or position; immediately adjoining without intervening space“had adjacent rooms”, “in the next room”, “the person sitting next to me”, “our rooms were side by side”
(s)adjacent, conterminous, contiguous, neighboring, neighbouringhaving a common boundary or edge; abutting; touching“Rhode Island has two bordering states: Massachusetts and Connecticut”, “the side of Germany conterminous with France”, “Utah and the contiguous state of Idaho”, “neighboring cities”