Translation guide
The English word 'adjacent' is used to describe things that are next to or very near each other, often sharing a boundary. In Japanese, there is no single perfect equivalent; the best choice depends on whether you are talking about physical proximity, abstract relationships, or formal/technical contexts.
Describing rooms, buildings, land, or objects that are directly beside each other, often touching or sharing a wall/edge.
The most direct and common translation for 'adjacent' in physical contexts. Used for buildings, rooms, land, etc. that are next to each other. Often used in formal or written descriptions.
隣接した部屋から音が聞こえた。
I could hear sounds from the adjacent room.
この土地は公園に隣接している。
This land is adjacent to the park.
The most natural, everyday word for 'next' or 'adjacent' when referring to rooms, houses, seats, etc. It implies immediate proximity and is used in casual and spoken Japanese.
隣の部屋は空いていますか？
Is the adjacent room available?
隣の席に座ってもいいですか？
May I sit in the adjacent seat?
Means 'touching' or 'adjoining'. Used when two things are in direct contact, like two pieces of land or objects. Slightly more technical than 隣接した.
二つの国は国境で接している。
The two countries are adjacent along the border.
Emphasizes immediate adjacency, like 'right next door'. Very common in speech.
すぐ隣の家が火事になった。
The house immediately adjacent caught fire.
Describing things that are close by, in the vicinity, or neighboring without sharing a boundary.
The most common way to say 'nearby' or 'adjacent' in a loose sense. Used for locations, buildings, etc. that are close but not necessarily touching.
ホテルは駅の近くにあります。
The hotel is adjacent to the station. (nearby)
More formal than 近くの, often used in written notices or announcements to mean 'in the vicinity' or 'adjacent area'.
付近の住民に避難勧告が出された。
An evacuation advisory was issued for residents in adjacent areas.
Describing concepts, fields, or topics that are closely related or next to each other in a non-physical sense.
Can be used metaphorically for fields of study, topics, etc. that are closely related or 'adjacent'. Often used in academic or technical contexts.
この研究は心理学に隣接する分野だ。
This research is in a field adjacent to psychology.
A simple and common way to say 'close' or 'adjacent' in an abstract sense, like ideas or concepts that are similar or related.
その二つの考え方はとても近い。
Those two concepts are very adjacent (closely related).
Specifically referring to adjacent angles, sides, or vertices in mathematics or technical drawings.
The standard term in geometry for 'adjacent', as in adjacent angles or sides.
隣接する二つの角の和は180度です。
The sum of two adjacent angles is 180 degrees.
隣接した (rinsetsu shita) is more formal and often used in written descriptions or official contexts. 隣の (tonari no) is the everyday word for 'next door' or 'adjacent' and is preferred in conversation.
While 隣接した is a correct translation, it can sound stiff in everyday conversation. Use 隣の or 近くの unless you need a formal or technical tone.