Translation guide
A key that opens multiple locks, often in a building or system. In Japanese, the most common term is マスターキー, a loanword from English. There are also native terms like 親鍵 and 合鍵, but 合鍵 more often means a duplicate key. This guide explains how to express the concept naturally.
A single key that can open many different locks, such as in a hotel, office, or apartment building.
The most common and widely understood term. A loanword from English, used in hotels, offices, and apartment buildings.
このマスターキーで全ての部屋を開けられます。
You can open all the rooms with this master key.
Literally 'parent key'. A native Japanese term, but less common than マスターキー. Used in technical or locksmith contexts.
親鍵があれば、どの部屋にも入ることができます。
If you have the master key, you can enter any room.
Usually means a duplicate key, but in some contexts can refer to a master key. Use with caution; clarify the meaning if needed.
Most Japanese speakers will understand 合鍵 as a duplicate key, not a master key. Only use this if the context makes it clear.
この合鍵は全室共通です。
This master key works for all rooms.
The system or concept of having a master key that opens multiple locks.
The standard term for a master key system, used in building management and security.
このビルはマスターキーシステムを採用しています。
This building uses a master key system.
Something that provides access to many things or solves many problems, like a 'master key' to success.
Literally 'all-purpose key'. Used metaphorically for something that unlocks many opportunities or solutions.
語学力は国際社会での万能の鍵だ。
Language skills are a master key in the international community.
The loanword can also be used figuratively, similar to English.
この知識が問題解決のマスターキーになる。
This knowledge will be the master key to solving the problem.