key

key/ ki /

noun, plural keys.
a small metal instrument specially cut to fit into a lock and move its bolt.
any of various devices resembling or functioning as a key:
the key of a clock.
key card.

adjective
chief; major; important; essential; fundamental; pivotal:
a key person in the company; key industries.

verb (used with object), keyed, key·ing.
to regulate or adjust (actions, thoughts, speech, etc.) to a particular state or activity; bring into conformity:
to key one’s speech to the intellectual level of the audience.
Music. to regulate the key or pitch of.

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