Kernel
nounverified·updated May 9, 2026
The essential center of a computer operating system, the core that provides basic services for all other parts of the operating system. A synonym is nucleus. A kernel can be contrasted with a shell, the outermost part of an operating system that interacts with user commands. Kernel and shell are terms used more frequently in Unix and some other operating systems than in IBM mainframe systems.
Framework senses
- §1
- The essential center of a computer operating system, the core that provides basic services for all other parts of the operating system. A synonym is nucleus. A kernel can be contrasted with a shell, the outermost part of an operating system that interacts with user commands. Kernel and shell are terms used more frequently in Unix and some other operating systems than in IBM mainframe systems.
- §1
- the choicest or most essential or most vital part of some idea or experience
- §2
- a single whole grain of a cereal
- §3
- the inner and usually edible part of a seed or grain or nut or fruit stone