• A small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh.
  • (mathematics) A set of pairs of a mapping's domain which are mapped to the same value.
  • (slang) The human clitoris.
  • The core, center, or essence of an object or system.

    "the kernel of an argument"

  • (US) The stone of certain fruits, such as peaches or plums.
  • (calculus) A function used to define an integral transform.

    "The Dirichlet kernel convolved with a function yields its Fourier series approximation."

  • (mathematics, fuzzy set theory) The set of members of a fuzzy set that are fully included (i.e., whose grade of membership is 1).
  • A single seed or grain, especially of corn or wheat.
  • (computing) The central part of many computer operating systems which manages the system's resources and the communication between hardware and software components.
  • (mathematics, algebra) Those elements, in the domain of a function, which the function maps to zero.

    "If a function is continuous then its kernel is a closed set."

  • The central (usually edible) part of a nut, especially once the hard shell has been removed.

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