[kawr, kohr]


verb (used with object), cored, cor·ing.


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.

Origin of core

1275–1325; 1945–50 for def 11; Middle English; origin uncertain; perhaps < Old French cors body < Latin corpus
Related formscore·less, adjective

Synonyms for core


[kawr, kohr]

noun Chiefly Scot.

a small company or group of people, especially a gang of miners or a small corps of workers.

Origin of core

1150–1200; Middle English chor(e) dance, company of dancers or singers. See chorus


[kawr-ee, kohr-ee]


Classical Mythology. Kore.


or C.O.R.E.

[kawr, kohr]


Congress of Racial Equality.


a combining form extracted from hard-core and used especially to form words that name a rebellious, antimainstream lifestyle, social movement, type of music, etc.: emocore; queercore. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for core

Contemporary Examples of core

Historical Examples of core

British Dictionary definitions for core



the central part of certain fleshy fruits, such as the apple or pear, consisting of the seeds and supporting parts
  1. the central, innermost, or most essential part of somethingthe core of the argument
  2. (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
  1. one of several processing units working in parallel in a computer
  2. a ferrite ring formerly used in a computer memory to store one bit of information
  3. short for core store
  4. (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


(tr) to remove the core from (fruit)
Derived Formscoreless, adjective

Word Origin for core

C14: of uncertain origin


n acronym for (in the US)

Congress of Racial Equality


n combining form

indicating a type of popular musicdancecore

adj combining form

indicating the number of processing units working in parallel in a computerdual-core
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for core

late 14c., probably from Old French coeur "core of fruit, heart of lettuce," literally "heart," from Latin cor "heart," from PIE root *kerd- "heart" (see heart). Nuclear reactor sense is from 1949.


mid-15c., from core (n.). Related: Cored; coring.

Online Etymology Dictionary, © 2010 Douglas Harper

core in Medicine




The central or innermost part.
The part of a nuclear reactor where fission occurs.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

core in Science



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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

core in Culture


In geology, the central region of the Earth; it extends fourteen hundred to eighteen hundred miles from the Earth's center.


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 New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with core


see rotten to the core.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.