Longman Dictionary of Contemporary English homepage

core

2 adjective
     
core2
1

core curriculum/subjects/skills etc

subjects that have to be studied at a school or college:
the national core curriculum
the core subjects of English, maths, and science
Schools have to deliver the core skills.
2

core business/activities/operations etc

the main business or activities of a company or organization:
The core business of airlines is flying people and cargo from place to place.
the company's core product
3

core values/beliefs

the values or beliefs that are most important to someone:
the core values of American liberalism, such as taxing the rich to help the poor

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