Augustinian \Au`gus*tin"i*an\, a. Of or pertaining to St. Augustine, bishop of Hippo in Northern Africa (b. 354 -- d. 430), or to his doctrines. [1913 Webster] {Augustinian canons}, an order of monks once popular in England and Ireland; -- called also {regular canons of St. Austin}, and {black canons}. {Augustinian hermits} or {Austin friars}, an order of friars established in 1265 by Pope Alexander IV. It was introduced into the United States from Ireland in 1790. {Augustinian nuns}, an order of nuns following the rule of St. Augustine. {Augustinian rule}, a rule for religious communities based upon the 109th letter of St. Augustine, and adopted by the Augustinian orders. [1913 Webster]