レガシー

れがしー

noun

legacy

business technology

1. legacy (positive)

legacy; something positive left behind, especially lasting achievements or heritage

オリンピックのレガシーを活(い)かす。

Make use of the Olympic legacy.

先人(せんじん)のレガシーを引(ひ)き継(つ)ぐ。

Inherit the legacy of our predecessors.

イベントのレガシーとして施設(しせつ)が残(のこ)った。

Facilities remained as the event's legacy.

2. legacy (outdated system)

legacy system; an outdated technology, system, or method that continues to be used

レガシーシステムの更新(こうしん)が急務(きゅうむ)だ。

Updating the legacy system is urgent.

レガシーコードを書(か)き換(か)える必要(ひつよう)がある。

We need to rewrite the legacy code.

レガシー技術(ぎじゅつ)からの移行(いこう)は難(むずか)しい。

Transitioning from legacy technology is difficult.

レガシー is a loanword from English "legacy" with two distinct uses in Japanese: positive heritage/achievements and outdated systems.

POSITIVE USAGE (Sense 1):

オリンピックレガシー (Olympic legacy)
文化的(ぶんかてき)レガシー (cultural legacy)
レガシーを残(のこ)す (to leave a legacy)

TECH/BUSINESS USAGE (Sense 2):

レガシーシステム (legacy system)
レガシーコード (legacy code)
レガシー資産(しさん) (legacy assets)
レガシー問題(もんだい) (legacy issues)

2020 TOKYO OLYMPICS:
The term gained prominence during discussions about the 東京(とうきょう)オリンピック and what lasting benefits (レガシー) would remain after the games.

IT context

In technology, "legacy" often carries a negative connotation of being outdated and difficult to maintain, though the systems may still be critical to operations.

Register: Neutral to formal. Common in business, technology, and media contexts.

general

Added 2026.1.21 15:46 · Revised 2026.9.2 13:01

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