core · noun /kɔːr/Full view
core (IMPORTANT PART)
C2 no plural the most important part of a system or principle
Dictionary examples:

core values

Better health care was at the core of the senator's campaign.

Learner example:

The aim of this paper is to respond to a call for proposals [from] a TV company which is planning to launch a program called "Making the World a Better Place" and to select the group of people which represents the core idea of this program. (Certificate of Proficiency in English; C2; Czech)

core (FRUIT)
C2 C the hard, central part of certain fruits, such as apples, which contains the seeds
Dictionary example:

Peel the apples and remove the cores.

Learner example:

So there it was, hidden in nature, occasionally trampled by a stray dog with no other companion than old cans and apple cores. (Certificate of Proficiency in English; C2; Spanish)

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