- Riemannian geometry
- Riemannian geometry [rē män′ē ən]n.[after G. F. B. Riemann (1826-66), Ger mathematician]a form of non-Euclidean geometry in which there are no parallel lines, since its figures can be conceived as constructed on a curved surface where all straight lines intersect, and in which the sum of the angles of a triangle exceeds 180°
English World dictionary. V. Neufeldt. 2014.