The quality of agreeing or corresponding; being suitable and appropriate.
Matrix similarity by an orthogonal matrix.
A relation between two numbers indicating they give the same remainder when divided by some given number.
More generally: any equivalence relation defined on an algebraic structure which is preserved by operations defined by the structure.
The quality of being isometric — roughly, the same measure and shape.
The quality or state of being simultaneous; simultaneousness.
More than one complete musical texture occurring at the same time. This first appeared in the music of Charles Ives, and is common in the music of Conlon Nancarrow, and others.