vicenary UK /ˈvɪsən(ə)ɹi/US /ˈvɪsəˌnɛɹi/adjective 1noun 1forms 1 adjective1 •Of, pertaining to, or based on the number twenty. noun1 •(no longer used) An officer in command of twenty men.Delicat, another Captaine, or vicenarie in Sara, hauing vnder him twenty assistants. — 1603 formsvicenaries