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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.

1. To lock with a key. 2. To be the determining or crucial factor in: a double that keyed a three-run rally in the fifth inning. 3. Architecture To furnish (an arch) with a keystone. 4. Music To …

KEY definition: 1. a piece of metal that has been cut into a special shape and is used for opening or closing a…. Learn more.

Definition of key noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

a position or condition which affords entrance, control, pr possession, etc.; as, the key of a line of defense; the key of a country; the key of a political situation.

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.

Of crucial importance; significant. Key decisions; the key element of the thesis.

Nov 15, 2020 · A primary key, as the name might give away, is a key that operates as the main key in a building, being able to open every door. While there will be other keys that correspond …

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 …