genarian UK /d͡ʒɪˈnɛəɹi.ən/US /d͡ʒɪˈnɛɹi.ən/adjective 1noun 1forms 1 adjective1 •Concerning rules or principles as opposed to acts.This distinguishes his position from that of rule-utilitarians like Brandt, with whom Hare otherwise largely agrees, and makes Hare an actarian in my sense rather than a genarian. — 1979 noun1 •An elderly person, especially one over the age of 60.Let all the genarians pass in review — The procession will last but a minute or two. — 1955 formsgenarians