chave mestra; chave principal
1. The most important or primary key that provides access to something or unlocks the main solution to a problem
The chief key to success in business is understanding your customer's needs.
A chave principal para o sucesso nos negócios é entender as necessidades do cliente.
2. In security or lock systems, the master key that opens all locks in a system
The superintendent kept the chief key to all apartments in the building.
O síndico guardava a chave mestra de todos os apartamentos do edifício.
3. In music, the fundamental or primary tonality or key signature
The composition begins in the chief key of C major.
A composição começa na tonalidade principal de Dó maior.
The term 'chief key' is often used metaphorically in both English and Portuguese to refer to the fundamental solution or most important element needed to achieve a goal. In security contexts, it's a literal term referring to master keys used by building administrators and property managers in both Brazilian and American contexts.
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