vicenarious
adjUK /ˌvɪsəˈnɛəɹi.əs/ · US /ˌvɪsəˈnɛɹi.əs/
Etymology From Latin vīcēnārius, from vīcēnus (“twenty each”) + -ārius (“-ary: forming adjectives and related nouns”). Doublet of vicenary. Ultimately cognate with English vigenary.
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Rare Synonym of vicenary: of, pertaining to, or based on the number twenty.