core

adjective2

1. •
   central and most important

   • Privately held businesses may hold assets or have charges to their financial statements which are not core to their main business activity. — 2009
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. — 2015

noun30

1. •
   In general usage, an essential part of a thing surrounded by other essential things.
2. •
   The central part of a fruit, containing the kernels or seeds.
3. •
   The heart or inner part of a physical thing.
4. •
   The anatomical core, muscles which bridge abdomen and thorax.
5. •
   The center or inner part of a space or area.
6. •
   The inner part of a nuclear reactor, in which the nuclear reaction takes place.
7. •
   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.
8. •
   The most important part of a thing or aggregate of things wherever located and whether of any determinate location at all; the essence.

   • 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. — 2018
9. •
   A technical term for classification of things denoting those parts of a category that are most easily or most likely understood as within it.
10. •
    The main and most diverse monophyletic group within a clade or taxonomic group.
11. •
    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.
12. •
    particular parts of technical instruments or machines essential in function.
13. •
    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.
14. •
    The material between surface materials in a structured composite sandwich material.
15. •
    A piece of ferromagnetic material (e.g., soft iron), inside the windings of an electromagnet, that channels the magnetic field.
16. •
    A hollow cylindrical piece of cardboard around which a web of paper or plastic is wound.
17. •
    A tiny sample of organic material obtained by means of a fine-needle biopsy.
18. •
    A cylindrical sample of rock or other materials obtained by core drilling.
19. •
    A thematic aesthetic; objects related to a specific topic

    • Photographs of cottagecore focuses on countrysides or forests.
20. •
    An aesthetic ending in the suffix -core, such as cottagecore, normcore, etc.
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.
22. •
    An atomic nucleus plus inner electrons (i.e., an atom, except for its valence electrons).
23. •
    The central part of a protein's structure, consisting mostly of hydrophobic amino acids.
24. •
    The set of feasible allocations that cannot be improved upon by a subset (a coalition) of the economy's agents.
25. •
    The bony process which forms the central axis of the horns in many animals.
26. •
    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.
27. •
    (informal, historical) Ellipsis of core memory (“magnetic data storage”).
28. •
    A miner's underground working time or shift.
29. •
    A disorder of sheep caused by worms in the liver.

    • [the skin of the sheep] is clear from cores and jogs under the jaws. — 1750
30. •
    (no longer used) A body of individuals; an assemblage.

    • He was in a core of people. — 1622

verb3

1. •
   To remove the core of an apple or other fruit.
2. •
   To cut or drill through the core of (something).
3. •
   To extract a sample with a drill.

noun1

1. •
   Acronym of corporate responsibility.