vicenary
An officer in command of twenty men.
archaic, obsolete
Delicat, another Captaine, or vicenarie in Sara, hauing vnder him twenty assistants.
Where it comes from
From Latin vīcēnārius, from vīcēnus (“twenty each”) + -ārius (“-ary: forming adjectives and related nouns”). Doublet of vicenarious. Ultimately cognate with English vigenary.
Adapted from the Wiktionary entry vicenary (CC BY-SA 4.0).