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The meaning of KEY is a usually metal instrument that is used to open a lock or to start or access a mechanism. How to use key in a sentence.

A key is a specially shaped piece of metal that you place in a lock and turn in order to open or lock a door, or to start or stop the engine of a vehicle. They put the key in the door and entered.

The usual type of key is a small metal object that you insert into a narrow opening and turn.

Something regarded as like a key in opening or closing a way, revealing or concealing, etc.

Login error for KeyBank online banking.

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You can also use smartphones to sign on to online banking at Key.com. For the best online banking security and experience, we recommend using the most recent version of the browsers Safari, …