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core is on the Academic Word List.

Pronunciation

change

Singular
core

Plural
cores

Core is on the Academic Vocabulary List.
 
An apple core.
  1. (countable) The core is the centre part of something.
    I bit into the apple core and spit out the seeds.
    The ideas in it still form the core of the government's economic plan.
    A core group of fans follow the team to every game.
    I was shaken to the core when I heard the terrible news.

Plain form
core

Third-person singular
cores

Past tense
cored

Past participle
cored

Present participle
coring

  1. (transitive) If you core something, you remove the centre from it.
    lemon juice • 4 eating apples, peeled, halved and cored • 1 tbsp of...