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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.

Common uses Key (cryptography), a piece of information needed to encode or decode a message Key (instrument), a component of a musical instrument Key (lock), a device used to operate a …

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 regulate …

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.

Jun 30, 2025 · A key (object designed to open and close a lock) A numeric keypad with 16 keys The keys of a musical keyboard. The key of a map. A telegraph key

key noun (MOVABLE PART) [ C ] any of the set of movable parts that you press with your fingers on a computer or other machine to produce letters, numbers, or symbols, or on a musical instrument …

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.

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

Find 616 different ways to say KEY, along with antonyms, related words, and example sentences at Thesaurus.com.