The property of remaining invariable under prescribed or implied conditions.

In music using the twelve tone technique invariance describes the portions of rows which have been so designed that they remain invariant under the allowable transformations (inversion, retrograde, retrograde-inversion, multiplication). George Perle describes their use as "pivots" or non-tonal ways of emphasizing certain pitches. Invariant rows are also combinatorial.

Invariance is a French journal edited by Jacques Camatte, published since 1968.

the quality of being resistant to variation