Submitted by György Chityil ... on Fri, 01/19/2018 - 20:21 Hierarchy: NounDescription: {{algebra|and|category theory}} A set with a partial binary operation that is associative and has inverses and identities.Ngram: groupoidNgram Text: groupoidSource: WiktionaryIssue: 0Wiktionary tag: algebraandcategory theoryNgram Count: 1