The core of something such as a problem or an issue is the part of it that has to be understood or accepted before the whole thing can be understood or dealt with.

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 …

Jun 5, 2025 · Earth is divided into three main layers. The dense, hot inner core (yellow), the molten outer core (orange), the mantle (red), and the thin crust (brown), which supports all life …

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

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 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.

Welcome to the home page for Core-CT, Connecticut state government's integrated human resources, payroll and financial system. Based on your role, please use the links on the left to …

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CORE definition: 1. the basic and most important part of something: 2. the hard central part of some fruits, such…. Learn 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.