invariance
nounThe state of staying the same and not changing.
The invariance of the rules meant everyone played by the same standards all day.
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OTHER MEANINGS
2. In mathematics, a property that does not change when a shape or figure is moved, rotated, or resized.
The invariance of distance under rotation is a basic idea in geometry.
3. In physics, the quality of a law or quantity remaining the same under certain transformations.
The invariance of the speed of light is a key principle of relativity.
4. In statistics, the property of a result staying the same when data are transformed in certain ways.
The invariance of the test under scaling made the results easier to compare.
5. The quality of remaining unaffected by changes in conditions or surroundings.
The invariance of her mood surprised everyone during the stressful week.