key Meaning, definition in Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of "key" - English Dictionary

See all translations

keynoun [C]

uk   us   /kiː/

key noun [C] (LOCK)

A1 a piece of metal that has been cut into a special shape and is used for opening or closing a lock, starting a car engine, etc.: car/door keys
More examples

key noun [C] (PART)

B2 any of the set of moving parts that you press with your fingers on a computer keyboard, or musical instrument to produce letters, numbers, symbols, or musical notes
More examples

key noun [C] (MUSICAL NOTES)

a set of musical notes based on one particular note: The song changes key halfway through. the key of C minor

key noun [C] (SYMBOLS)

a list of the symbols used in a map or book with explanations of what they mean

key noun [C] (ANSWERS)

A2 a list of the answers to the questions in an exercise or test: See the key to test 3 on page 176.

keyadjective

uk   us   /kiː/
B2 very important and having a lot of influence on other people or things: She was a key figure in the international art world. a key factor in tackling the problem
More examples
(Definition of key from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of key?
Add Cambridge dictionaries to your browser to your website

Definitions of “key” in other dictionaries

Word of the Day
tweet

a short remark or piece of information published on Twitter�

Word of the Day

The cake was made by my sister: how to use the passive in English.
The cake was made by my sister: how to use the passive in English.
by Liz Walter,
June 24, 2015
Look at these two sentences: My sister made the cake. The cake was made by my sister. Both these sentences mean the same. The first is an active sentence: it tells you what the sister did. The second is a passive sentence: it tells you what happened to the cake. Here are

Read More 

burger noun
burger noun
June 29, 2015
a menu on a computer screen comprising three short parallel horizontal lines which the user clicks to see options Definitely use a burger. You could put the settings in the burger menu too. Fix the settings to the bottom of the burger menu and use a vertically scrolling contact list that scrolls behind

Read More