Key ( noun , adjective , verb )

(As a noun)

Key ( noun )

1. A metal instrument that is inserted into a lock and turned to lock or unlock a door or gate.
2. A mechanical or electrical device that is used to control the operation of a machine, vehicle, or system.
3. A code or password used to encrypt or decrypt a message.
4. A piece of information that is used to solve a problem or explain a mystery.
5. A musical note or series of notes that serves as the main basis of a piece of music and determines its tonality.
6. A small hard-shelled seed that is eaten, especially as a snack food.

Origin:

Middle english, from old english cǣg, from latin clavis; akin to latin claudere 'to shut'.

Examples:

1. The key to the cabinet was missing.
2. She held the key to his heart.
3. The key of the piano was out of tune.
4. She kept a record of all her passwords in a key manager software.
5. The key to the car is on the kitchen counter.

(As an adjective)

Key ( adjective )

1. Of great importance or significance.
2. Essential or critical.
3. Forming a basis or foundation.
4. Forming a central part or aspect of something.

Origin:

Middle english, from old english cǣg, from latin clavis; akin to latin claudere 'to shut'.

Examples:

1. The key factor in his decision was the potential risks.
2. He found the key ingredient to the perfect recipe.
3. The key witness in the case has yet to be located.
4. She has a key role in the company's success.
5. The key advantage of the new system is its efficiency.

(As a verb)

Key ( verb )

1. To lock or unlock (something) with a key.
2. To adjust or set (something) so that it is in the correct position or operating correctly.
3. To encrypt or decrypt (a message) using a key.

Origin:

Middle english, from old english cǣg, from latin clavis; akin to latin claudere 'to shut'.

Examples:

1. She keyed the correct code into the lock and opened the door.
2. The computer program automatically keys in data.
3. The player keyed in the commands to control his avatar.
4. The student keyed the answers into the online test.
5. He has the ability to key in data quickly and accurately.