invariant section (plural invariant sections)
- (law) Something that must not be removed or modified during redistribution.
- I had to include the GNU Manifesto, as it was part of an invariant section.
- (mathematics) A section that will not vary through changing state.
- (programming) A property that does not change through a program's execution.
- (mathematics): Often used in the form X-invariant section, implying a section that remains constant while X is being changed.