the central part of a fleshy fruit, containing the seeds.
the central, innermost, or most essential part of anything.
Also called magnetic core. Electricity. the piece of iron, bundle of iron wires, or other ferrous material forming the central or inner portion in an electromagnet, induction coil, transformer, or the like.
(in mining, geology, etc.) a cylindrical sample of earth, mineral, or rock extracted from the ground by means of a corer so that the strata are undisturbed in the sample.
the inside wood of a tree.
Anthropology. a lump of stone, as flint, from which prehistoric humans struck flakes in order to make tools.
Carpentry.
a thickness of wood forming a base for a veneer.
a wooden construction, as in a door, forming a backing for veneers.
Engineering. kern.
Metallurgy.
a thickness of base metal beneath a cladding.
the softer interior of a piece of casehardened metal.
a specially formed refractory object inserted into a mold to produce cavities or depressions in the casting that cannot be readily formed on the pattern.
Geology. the central portion of the earth, having a radius of about 2,100 miles (3,379 km) and believed to be composed mainly of iron and nickel in a molten state.
Also called reactor core. Physics. the region in a reactor that contains its fissionable material.
Computers.
Also called magnetic core. a small ring or loop of ferromagnetic material with two states of polarization that can be changed by changing the direction of the current applied in wires wound around the ring, used to store one bit of information or to perform switching or logical functions.
Also called main memory. Also called RAM. a term used to refer to main memory, though no longer made from from coils of ferromagnetic material.
Ropemaking. heart.
Phonetics. the final segment of a syllable beginning with the vowel and including any following consonants; the nucleus plus the coda.
the muscles of the torso, which provide support for the spine and pelvis.
Building a strong core can help with posture and flexibility and can prevent back injury.
to remove the core of (fruit).
to cut from the central part.
to remove (a cylindrical sample) from the interior, as of the earth or a tree trunk.
to core the ocean bottom.
to form a cavity in (a molded object) by placing a core, as of sand, in the mold before pouring.
of central importance; basic; fundamental.
the core values of our organization.
noting or relating to the muscles of the torso.
core exercises for back pain.
a combining form extracted from hard-core, used to form words that name a rebellious or nonmainstream lifestyle, social movement, type of music, etc..
the compounding form of core, used to form words describing an aesthetic or imagery that evokes nostalgia for vintage styles, traditional skills, past trends, etc..
the central part of certain fleshy fruits, such as the apple or pear, consisting of the seeds and supporting parts
the central, innermost, or most essential part of something
the core of the argument
( as modifier )
the core meaning
a piece of magnetic material, such as soft iron, placed inside the windings of an electromagnet or transformer to intensify and direct the magnetic field
geology the central part of the earth, beneath the mantle, consisting mainly of iron and nickel, which has an inner solid part surrounded by an outer liquid part
a cylindrical sample of rock, soil, etc, obtained by the use of a hollow drill
shaped body of material (in metal casting usually of sand) supported inside a mould to form a cavity of predetermined shape in the finished casting
physics the region of a nuclear reactor in which the reaction takes place
a layer of wood serving as a backing for a veneer
computing
one of several processing units working in parallel in a computer
a ferrite ring formerly used in a computer memory to store one bit of information
short for core store
( as modifier )
core memory
archaeol a lump of stone or flint from which flakes or blades have been removed
physics the nucleus together with all complete electron shells of an atom
The central or innermost portion of the Earth, lying below the mantle and probably consisting of iron and nickel. It is divided into a liquid outer core, which begins at a depth of 2,898 km (1,800 mi), and a solid inner core, which begins at a depth of 4,983 km (3,090 mi).
A piece of magnetizable material, such as a rod of soft iron, that is placed inside an electrical coil or transformer to intensify and provide a path for the magnetic field produced by the current running through the wire windings.
The central part of a nuclear reactor where atomic fission occurs. The core contains the fuel, the coolant, and the moderator.
A long, cylindrical sample of soil, rock, or ice collected with a drill to study the strata of material that are not visible from the surface.
A stone from which one or more flakes have been removed, serving as a tool in itself or as a source of flakes from which other tools could be fashioned. Stones used as cores include flint, chert, and obsidian.
See more at core tool
What does -core mean? The combining form -core is used like a suffix to denote "a rebellious, anti-mainstream lifestyle, social movement, type of music, etc."The form -core comes from the expression hardcore, "a form of punk rock or other nonmainstream popular music." Hardcore can denote not just a kind of a music but an entire lifestyle culture. From this, -core came to denote other music scenes, lifestyle cultures, or aesthetics.
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.
First recorded in 1350–1400; 1945–50 core 1 for def. 11; Middle English; origin uncertain; perhaps from Old French cors “body,” from Latin corpus
First recorded in 1620–30; alteration of Middle English chor(e) “group, company; choir”; see chorus
If you're looking for the most essential part or the very center of something, you're looking for its core. Like the inedible middle of an apple or your inner circle of core friends. In the late 14th century, the noun core came about from the Old French coeur, meaning “core of fruit” and more literally, “heart.” So the core of something is its very heart, whether you're talking about the seed-containing center of a fruit, the central meaning of a book, or the core courses you need to take in order to graduate.
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Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
About 10 years after first reading about Manson, she made a discovery that chilled her to her core: She was not only related to Manson — she was his granddaughter.
From Los Angeles Times ● Jul. 22, 2026
Independent director and producer Jon Erwin insists the core of the craft isn't going anywhere.
From Barron's ● Jul. 22, 2026
Given the core objective in play, the President would also be justified in taking a risk to launch a Special Forces operation.
From The Wall Street Journal ● Jul. 21, 2026
Benn and Sir Keir Starmer made a core part of their time in office fixing relations with the Irish government, which had been badly bruised during Brexit.
From BBC ● Jul. 20, 2026
In the early months of 1849, Leah, Maggie, and Kate, along with a core group of followers, the Posts, Rev. Clark, Capron, and others, explored the boundaries of this new spirit world.
From "American Spirits" by Barb Rosenstock
Core CPI was also 2.6% in the 12 months to June, which was unchanged from May.
From BBC ● Jul. 22, 2026
Core inflation could ease by 0.1 percentage point to 3.8% because of lower precious-metal prices, Citi Research analysts said.
From The Wall Street Journal ● Jul. 10, 2026
Core inflation, which has risen above 3%, was forecast by the staff to change little over the rest of the year.
From MarketWatch ● Jul. 8, 2026
Downtown has seen a few bright spots on the venue map, with newly-opened Pacific Electric in Chinatown and a revamped Bar Franca in the Historic Core.
From Los Angeles Times ● Jul. 8, 2026
Standards: Common Core or National Standards: Which state content and developmental standards are addressed in my lesson?
From "Music and the Child" by Natalie Sarrazin
Earlier this month, L.A.-based aid organization Community Organized Relief Effort, or CORE, founded by Sean Penn and Ann Lee, broke ground on one of the hamlet’s newest local gathering spots: the Altadena Center for Community.
From Los Angeles Times ● Feb. 4, 2026
Building and training an LLM from scratch is too costly for all but the wealthiest organizations, says Petr Knoth, director of CORE, the world’s largest repository of open-access papers.
From Science Magazine ● Nov. 21, 2023
Ann Lee, co-founder of US-based crisis response group CORE, which is still operating in the capital, said that many international groups had left due to increasing intimidation and violence against staff.
From BBC ● Aug. 18, 2023
Black church congregations folded bills hidden inside envelopes and sent the money to the Southern Christian Leadership Conference, to the Student Non-Violent Coordinating Committee, to the NAACP, to CORE.
From Washington Post ● Apr. 25, 2023
The assistance of CORE, with its national network of activists and long experience with direct-action campaigns, would be vital in transforming the Greensboro sit-in from an isolated “incident” into a true movement.
From "The Best of Enemies" by Osha Gray Davidson
These dense stellar remnants are the leftover cores of Sun like stars that have exhausted their fuel and collapsed to only about 1% of their original size.
From Science Daily ● Jul. 10, 2026
So they turn to cut-through notches, carved light wells, and strategic wall-offs of interior cores that create space for new residential floors.
From The Wall Street Journal ● Jul. 7, 2026
As parts of these clouds collapse under gravity, they create dense regions known as molecular cloud cores where new stars begin to take shape.
From Science Daily ● Jun. 5, 2026
According to Dai, AI data centers typically need about 30 million CPU cores, or the individual processing units inside the CPU, while agentic-AI data centers will require about 120 million CPU cores.
From MarketWatch ● May 18, 2026
The more he recalled, the less sense it made....Voldemort had said nothing about Harry’s wand, nothing about the twin cores, nothing about Gregorovitch making a new and more powerful wand to beat Harry’s....
From "Harry Potter and the Deathly Hallows" by J.K. Rowling
Lately there has been increasing interest in smaller devices with a more spherical shape, like a cored apple.
From Scientific American ● Jun. 5, 2023
In 2020, just before the pandemic hit, Barichivich and Lara cored part of the Alerce Milenario with an increment borer—a T-shaped drill that scientists use to excise narrow cylinders of wood without harming the tree.
From Science Magazine ● May 19, 2022
Many he cored turned out to be more than a century old.
From Seattle Times ● Mar. 21, 2021
They studied, cored and examined the rings of a portion of those trees and learned they all had at least one thing in common: They used water more efficiently than their deceased neighbors.
From Los Angeles Times ● Nov. 18, 2019
They are first peeled and cored and then cooked with sugar, water, and sometimes cinnamon, or cloves, both in powder and according to taste; also lemon-juice or rind to taste.
From Hand-Book of Practical Cookery for Ladies and Professional Cooks by Blot, Pierre
It’s comfortable in my hand, sharp and precise without feeling fussy, and it turns the quiet, repetitive work of cooking — chopping onions, coring fruit, slicing protein — into something smoother, even a little satisfying.
From Salon ● Apr. 21, 2026
Researchers used a special coring drill - a bit like a huge apple-corer - tethered to a research ship, to drill at depths of up to 500m.
From BBC ● Aug. 18, 2025
She joined Neff in pushing for the Thwaites collaboration to include ice coring, but a combination of competing priorities, perpetually bad weather, and difficult logistics stood in the way.
From Science Magazine ● Apr. 18, 2024
While balancing on the small raft, they'd screw metal rods together to lower a long slender coring tube over 50 feet to the lake bottom.
From Science Daily ● Oct. 17, 2023
Toasting bread and cheese, coring apples, placing chestnuts in the fire to roast.
From "Catching Fire" by Suzanne Collins
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
