Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “key”

key

noun [C] (MUSICAL NOTES)    /kiː/
a set of musical notes based on one particular note : The song changes key halfway through. the key of C minor Technical music terms
(Definition of key noun (MUSICAL NOTES) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of key

Definitions of “key” in other dictionaries

Word of the Day

drizzle

to pour liquid slowly over something, especially in a thin line or in small drops

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More