Submitted by György Chityil ... on Fri, 01/19/2018 - 18:32 Hierarchy: NounDescription: {{set theory}} A binary relation that is reflexive and transitive.Ngram: preorderNgram Text: preorderSource: WiktionaryIssue: 0Wiktionary tag: set theoryNgram Count: 1Wikokit WikiText ID: 1093741