noun
sacred boundary; ritual enclosure; temple barrier
Buddhist term for a consecrated area or boundary that separates the sacred from the profane, often used to keep out impurities or hindrances. Sense 3 specifically refers to a physical fence between inner and outer sanctums.
僧侶が結界を張って、邪気が入らないようにした。
The monk set up a sacred boundary to keep out evil spirits.
この寺院の結界は
The barrier in this temple separates the inner sanctum from the outer sanctum.
noun
shop lattice; store counter lattice
Archaic term for a short folding lattice placed around the front desk of a store, similar to 帳場格子.
See also: 帳場格子
江戸時代の商家では、帳場の前に結界が置かれていた。
In Edo-period merchant houses, a lattice barrier was placed in front of the accounting desk.
noun
barrier; force field; mystical barrier
Colloquial, especially in games, manga, and fantasy contexts. Refers to an invisible or magical barrier that blocks movement or contains something.
敵の魔法使いが強力な結界を張って、攻撃を防いだ。
The enemy wizard erected a powerful barrier to block the attacks.
このエリアは結界で囲まれていて、モンスターが出られないようになっている。
This area is surrounded by a containment barrier so that monsters cannot get out.
From Buddhist terminology, combining 結 (bind, tie) and 界 (boundary, world), referring to a ritually demarcated sacred space. The colloquial sense likely extended from the idea of a mystical boundary.