key

US /kiː/
UK /kiː/
"key" picture
1.

a small piece of shaped metal with incisions cut to fit the wards of a particular lock, which is inserted into a lock and turned to open or close it.

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I can't find my car keys.
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She locked the door and put the key in her pocket.
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openerunlocker
2.

a thing that is of crucial importance to a situation, problem, or explanation.

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Communication is the key to a successful relationship.
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The detective found the key piece of evidence.
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crucialessentialvitalcriticalpivotal
1.

of crucial importance.

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This is a key decision for the company's future.
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He played a key role in the negotiations.
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crucialessentialvitalcriticalpivotal
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key inkey cardkey gripkey signaturekey fobhold the key