[Au.gus.tin.i.an] n (1602) 1: a member of an Augustinian order; specif: a friar of the Hermits of St. Augustine founded in 1256 and devoted to educational, missionary, and parish work
2: a follower of St. Augustine
[2]Augustinian adj (1674) 1: of or relating to St. Augustine or his doctrines
2: of or relating to any of several orders under a rule ascribed to St. Augustine -- Au.gus.tin.i.an.ism n