n. 1 the male head of a family or tribe. 2 (often in pl.) Bibl. any of those regarded as fathers of the human race, esp. the sons of Jacob, or Abraham, Isaac, and Jacob, and their forefathers. 3 Eccl. a the title of a chief bishop, esp. those presiding over the Churches of Antioch, Alexandria, Constantinople, and (formerly) Rome; now also the title of the heads of certain autocephalous Orthodox Churches. b (in the Roman Catholic Church) a bishop ranking next above primates and metropolitans, and immediately below the pope. c the head of a Uniate community. 4 a the founder of an order, science, etc. b a venerable old man. c the oldest member of a group. patriarchal adj. patriarchally adv.
[ ME f. OF patriarche f. eccl.L patriarcha f. Gk patriarkhes f. patria family f. pater father + -arkhes -ruler ]