境 界(きょうかい)

きょうかい

noun

boundary, border, dividing line

1. boundary, border, dividing line

A line or limit that separates two areas, regions, or concepts. Used for physical borders (between properties, regions) and abstract boundaries (between categories, states).

ここが県(けん)の境界(きょうかい)だ。

This is the prefectural boundary.

現実(げんじつ)と夢(ゆめ)の境界(きょうかい)が曖昧(あいまい)になる。

The boundary between reality and dreams becomes blurred.

隣(となり)の家(いえ)との境界(きょうかい)にフェンスを建(た)てることにした。

We decided to put up a fence on the boundary with the neighboring house.

Usage

Used for both concrete and abstract boundaries. In property and land contexts, 境界(きょうかい) refers to the legal dividing line between parcels. In abstract use, it often appears in expressions about blurred or crossed boundaries between concepts.

Common collocations

境界(きょうかい)線(せん): boundary line
境界(きょうかい)を越(こ)える: cross a boundary
境界(きょうかい)が曖昧(あいまい): boundary is vague/blurred
～との境界(きょうかい): boundary with ~
国(くに)の境界(きょうかい): national border

Similar words

境界(きょうかい) is the general term for any boundary or dividing line. 国境(こっきょう) specifically means national border. 境目(さかいめ) is a more colloquial word for the point where things change or divide.

Related Words

Synonym: 境(さかい) (boundary (native word))

Related: 国境(こっきょう) (national border)

Synonym: 境目(さかいめ) (dividing point (colloquial))

general

Added 2026.2.20 13:55 · Revised 2026.9.2 13:01

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