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core

nounadjectiveverbnounnounnounnounnouncommon in dialogue

  • United Kingdom//kɔː//
  • United States//kɔɹ//
  • United States/[kʰo̞ɹ]/
  • //ko(ː)ɹ//
  • //koə//

In general usage, an essential part of a thing surrounded by other essential things. The central part of a fruit, containing the kernels or seeds.

noun

  1. 1

    In general usage, an essential part of a thing surrounded by other essential things. The central part of a fruit, containing the kernels or seeds.

    the core of an apple or quince

  2. 2

    In general usage, an essential part of a thing surrounded by other essential things. The heart or inner part of a physical thing.

    Reindeer are well suited to the taiga’s frigid winters. They can maintain a thermogradient between body core and the environment of up to 100 degrees, in part because of insulation provided by their fur, and in part because of counter-current vascular heat exchange systems in their legs and nasal passages.

  3. 3

    In general usage, an essential part of a thing surrounded by other essential things. The anatomical core, muscles which bridge abdomen and thorax.

  4. 4

    In general usage, an essential part of a thing surrounded by other essential things. The center or inner part of a space or area.

    the core of the square

  5. 5

    The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence.

    the core of a subject

    Jones’ sad eyes betray a pervasive pain his purposefully spare dialogue only hints at, while the perfectly cast Brolin conveys hints of playfulness and warmth while staying true to the craggy stoicism at the character’s core.

    General vocabulary is often defined as a common core of English words and operationalized as the most frequent words in a balanced and representative corpus of English.

  6. 6

    The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence. A technical term for classification of things denoting those parts of a category that are most easily or most likely understood as within it. The main and most diverse monophyletic group within a clade or taxonomic group.

  7. 7

    The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence. A technical term for classification of things denoting those parts of a category that are most easily or most likely understood as within it. The set of feasible allocations that cannot be improved upon by a subset (a coalition) of the economy's agents.

  8. 8

    The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence. A thematic aesthetic; objects related to a specific topic

    Photographs of cottagecore focuses on countrysides or forests.

  9. 9

    particular parts of technical instruments or machines essential in function: The portion of a mold that creates a cavity or impression within the part (casting or molded part) or that makes a hole in or through the part.

  10. 10

    particular parts of technical instruments or machines essential in function: An individual computer processor, in the sense when several processors (called cores or CPU cores) are plugged together in one single integrated circuit to work as one (called a multi-core processor).

    I wanted to play a particular computer game, which required I buy a new computer, so while the game said it needed at least a dual-core processor, I wanted my computer to be a bit ahead of the curve, so I bought a quad-core.

  11. 11

    particular parts of technical instruments or machines essential in function: The material between surface materials in a structured composite sandwich material.

    a floor panel with a Nomex honeycomb core

  12. 12

    particular parts of technical instruments or machines essential in function: The inner part of a nuclear reactor, in which the nuclear reaction takes place.

    In the engine room, the changing angle dropped the melted core to the deck. The hot mass attacked the steel deck first, burning through that, then the titanium of the hull. Five seconds later the engine room was vented to the sea.

  13. 13

    particular parts of technical instruments or machines essential in function: The central fissile portion of a fission weapon.

    In a hollow-core design, neutrons escape from the core more readily, allowing more fissile material to be used (and thus allowing for a greater yield) while still keeping the core subcritical prior to detonation.

  14. 14

    particular parts of technical instruments or machines essential in function: A piece of ferromagnetic material (e.g., soft iron), inside the windings of an electromagnet, that channels the magnetic field.

  15. 15

    particular parts of technical instruments or machines essential in function: A hollow cylindrical piece of cardboard around which a web of paper or plastic is wound.

  16. 16

    Hence particular parts of a subject studied or examined by technical operations, likened by position and practical or structural robustness to kernels, cores in the general sense above. A tiny sample of organic material obtained by means of a fine-needle biopsy.

  17. 17

    Hence particular parts of a subject studied or examined by technical operations, likened by position and practical or structural robustness to kernels, cores in the general sense above. The bony process which forms the central axis of the horns in many animals.

  18. 18

    Hence particular parts of a subject studied or examined by technical operations, likened by position and practical or structural robustness to kernels, cores in the general sense above. A disorder of sheep caused by worms in the liver.

    [the skin of the sheep] is clear from cores and jogs under the jaws.

  19. 19

    Hence particular parts of a subject studied or examined by technical operations, likened by position and practical or structural robustness to kernels, cores in the general sense above. The central part of a protein's structure, consisting mostly of hydrophobic amino acids.

  20. 20

    Hence particular parts of a subject studied or examined by technical operations, likened by position and practical or structural robustness to kernels, cores in the general sense above. A cylindrical sample of rock or other materials obtained by core drilling.

  21. 21

    Hence particular parts of a subject studied or examined by technical operations, likened by position and practical or structural robustness to kernels, cores in the general sense above. An atomic nucleus plus inner electrons (i.e., an atom, except for its valence electrons).

  22. 22

    Variant of core memoryhistoricalparticular parts of technical instruments or machines essential in function: Ellipsis of core memory (“magnetic data storage”).

Etymology

From Middle English core, kore, coor (“apple-core, pith”), of obscure and uncertain origin. Possibly of native English origin, from Old English *cor, related to Old English *coruc, *corc (diminutive) (> Middle English cork, crok (“core of an apple or other fruit, heart of an onion”)) and Old English corn (“seed", also "grain”); or alternatively perhaps from Old French cuer (“heart”), from Latin cor (“heart”); or from Old French cors (“body”), from Latin corpus (“body”). Compare also Middle English colk, coke, coll (“the heart or centre of an apple or onion, core”), Dutch kern (“core”), German Kern (“core”). See also heart, corpse. Compare typologically Russian серде́чник (serdéčnik), сердцеви́на (serdcevína)) (akin to се́рдце (sérdce), cognate with heart, Latin cor).

adjective

  1. 1

    Forming the most important or essential part.

    Privately held businesses may hold assets or have charges to their financial statements which are not core to their main business activity.

    Private-equity nabobs bristle at being dubbed mere financiers. Piling debt onto companies’ balance-sheets is only a small part of what leveraged buy-outs are about, they insist. Improving the workings of the businesses they take over is just as core to their calling, if not more so. Much of their pleading is public-relations bluster.

    These lists cover important vocabulary from eight core subjects that students need to master during secondary education: Biology, Chemistry, Economics, English, Geology, History, Mathematics, and Physics.

  2. 2

    Deeply and authentically involved in the culture surrounding the sport.

    Our interest is not in core skaters such as young males and pro skaters but the voices of those on the periphery of the subculture.

    We had a segmentation strategy, where the small, independent core skate shops — the three hundred boutiques around the country who really created us — had a certain product line that was exclusive to them. […] We said to the core shops, you don't have to compete with the malls.

    […] which provoked resistance among the 'core' snowboarders.

verb

  1. 1

    To remove the core of an apple or other fruit.

  2. 2

    To cut or drill through the core of (something).

  3. 3

    To extract a sample with a drill.

noun

  1. 1

    obsoleteA body of individuals; an assemblage.

    He was in a core of people.

Etymology

See corps.

noun

  1. 1

    A miner's underground working time or shift.

Etymology

See chore.

noun

  1. 1

    Variant of corhistoricalAlternative form of cor: a former Hebrew and Phoenician unit of volume.

Etymology

From Biblical Hebrew כֹּר (kōr).

noun

  1. 1

    A deposit paid by the purchaser of a rebuilt part, to be refunded on return of a used, rebuildable part, or the returned rebuildable part itself.

Etymology

Possibly an acronym for cash on return.

noun

  1. 1

    An aesthetic ending in the suffix -core, such as cottagecore, normcore, etc.

    Some of the most popular "cores" at the moment—according to the Wiki's "trending pages" list—are cottage and goblin and trauma and angel. If the last one sounds appealing, you can participate by eating more meringues and buying a pet dove.

    The rise of micro-cores coincides with the rise of hyper-specific internet aesthetics. There's even an Aesthetics Wiki that chronicles all the possible cores online, including, but not limited to, bubblegumbitchcore, cottagecore, and fairycore.

    It's more than okay to let a microtrend be just that. Naming it as a "core" turns the clothing into a social media movement, and more often than not, the title is an overcomplication for rather basic color choices or fabric selections.

    The aesthetic makes a convincing case for finding joy in fashion and experimenting with personal style rather than chasing every new 'core' that comes along. It encourages real excitement about getting creative with the clothes you already have in your wardrobe and therein lies the thrill of it.

Etymology

From -core, ultimately from Etymology 1.

Forms

plural
cores
past tense
cored
past participle
cored
present participle
coring
third person singular
cores

core · In general usage, an essential part of a thing surrounded by other essential things. The central part of a fruit, containing the kernels or seeds.

Core · The birth name of Persephone/Proserpina, the queen of the…corey · A penis.Corey · An English surname from Old Norse from the Old Norse given…
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).