Core can be a noun, verb, or adjective, but is most often used as a noun to refer to the central or most important part of something (“the core of the issue,” “the Earth’s core”) or to the usually …

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The core of a nuclear reactor (= a device in which atoms are changed to produce energy) is the place where fission (= the dividing of atoms) happens.

Of basic importance; essential: "Virtually all cultures around the world use the word heart to describe anything that is core, central, or foundational" (Robert A. Emmons).

In a school or college, core subjects are a group of subjects that have to be studied. The core subjects are English, mathematics and science. A foreign language must be part of the core …

Definition of core noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Aug 10, 2025 · "Core" represents centrality, importance, and functionality across various domains. Whether describing a fruit, a principle, or a technical component, its meanings emphasize its …

The suffix -core is a term used to refer to visual styles and trends. The term later became associated with internet slang. Originating from the hardcore punk genre, the term gained …

The core is made primarily of iron and nickel and has two parts — an inner solid core and an outer liquid core. The mantle is the layer of the Earth that overlies the core.

the central part of the earth:[singular] the pressure at the earth's core. the most important or essential part of anything: the core of the new curriculum for business majors.