From Longman Dictionary of Contemporary Englishrigorrig‧or /ˈrɪɡə $ -ər/ noun x-refthe American spelling of rigour
Examples from the Corpus
rigor• It lacks intellectual content and academic rigor.• I believe in discovery and rigor and quantitative correctness and sophisticated analysis.• Anyway, rigor is in the very early stages.• I learn the importance of neatness, order, discipline, rigor, practice, and routine in learning.• The body was still warm and there were no signs of rigor.• Nor do we know anything about the quality or rigor of these experiences.• It would take nearly a book in itself to explain the scope, rigor, and stress of those tests.• Sometimes I think we confuse rigidity with rigor.Origin rigor (1300-1400) Old French Latin, from rigere; → RIGID 