Longman Dictionary of Contemporary English homepage

core

1 noun
     
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core1 W3 [countable]
1

fruit

HBP the hard central part of a fruit such as an apple:
Remove the cores, and bake the apples for 40 minutes.
2

most important part

the most important or central part of something
core of
The core of the book focuses on the period between 1660 and 1857.
Debt is at the core of the problem.
3

people

a number of people who form a group which is very important to an organization:
The business needs a new core of trained administrators.
a core group of clients
 ➔ hard core
4

to the core

extremely or completely
shaken/shocked/thrilled to the core
When I heard the news, I was shaken to the core.
That woman is rotten to the core!
He was a bureaucrat to the core.
5HEG

planet

the central part of the Earth or any other planet
6

nuclear reactor

HPTP the central part of a nuclear reactor
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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