Meaning & use
key
A small metal device shaped to open a lock, start an engine, or operate a mechanism.
See it in a sentence
She fumbled in her bag looking for the key to the front door.
Practice is the key to improving quickly at almost any new skill.
A note on using this word
Frequently used figuratively, meaning the essential factor for solving a problem or achieving success.
Words with a similar meaning
This term is best learned through its definition and examples.
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Another way to use it
2. adjective
Of central importance; crucial to a plan, situation, or outcome.
Clear communication was a key factor in the project's success.
3. noun
In music, a set of related notes and chords based on a particular scale.
The song shifted from a minor key to a brighter major key in the chorus.
Make it your own
Write a sentence using “key”, then compare your use with the examples above.