American Dictionary

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Definition core in American English

core noun

[countable] noun
/kɔr/
1

the most important or most basic part of something

Example

These 2,500 words form the core of the language.

Example

Financial instability lies at the core of the institute's problems.

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1.1

the members of a group who do the most work, or who support it most strongly

Example

Females comprise the core of the monkeys' social unit.

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2

the part inside an object that is nearest its center

Example

The ball has a core of hard rubber.

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2.1

the central part of a fruit such as an apple, containing the seeds

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2.2

the central part of a planet

Example

the Earth's core

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2.3

the central part of a nuclear reactor

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Definition core in American English