adjacent
Word family
- adjacencynoun
- adjacentlyadverb
Synonym discussion
Sense: adjective/1
These four expressions all describe things that sit close together, but they differ in formality and in how tightly the two things are joined. 'Next to' is the everyday choice — short, plain, and used in any kind of speech or writing. 'Neighbouring' is slightly more formal and suggests being in the same general area without claiming a shared edge: neighbouring villages may sit a few kilometres apart. 'Adjacent' is the most formal of the group and is favoured in legal, technical, or geographic writing; it usually means there is nothing between the two items. 'Adjoining' is the strongest — it implies a shared wall, door, or border, as in 'an adjoining bathroom'. So you might say 'the park next to my school', 'a neighbouring town', 'the field adjacent to the river', or 'two adjoining hotel rooms'.
Common collocations
Etymology
Borrowed into English in the late 1300s from Latin 'adiacent-', the present participle of 'adiacere' meaning 'to lie near'. The Latin verb is built from 'ad-' ('to, toward') and 'iacere' ('to lie or rest'), so the literal idea is 'lying alongside'. English picked the word up via Old French and used it first in formal geographic and mathematical writing before it spread into ordinary language.