Riemannian adjective 2noun 1forms 1 adjective2 •Of or relating to the work, or theory developed from the work, of German mathematician Bernhard Riemann, especially to Riemannian manifolds and Riemannian geometry.The object of this appendix is to give a summary of known results on 1-dimensional oriented Riemannian Foliations. — 2012 •Relating to the musical theories of German theorist Hugo Riemann, particularly his theory of harmony, which is characterised by a system of "harmonic dualism".And not only theory: most central European composers of this century were schooled in Riemannian doctrine of one type or another. — 1994 noun1 •One who uses or supports the work of German mathematician Bernhard Riemann. formsRiemannians