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 inedible …

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.

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

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.

CORE meaning: 1 : the central part of a fruit (such as an apple) that contains the seeds; 2 : the central part of something

Report an outage using our simple web-based form. You will need your CORE account number.

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).

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 broader prominence …

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 …

Core & Main is a leading specialized distributor of water, wastewater, storm drainage and fire protection products, and related services in the United States.”