I. ˌȯ-gə-ˈsti-nē-ən noun
Date: 1534
1. : a member of an Augustinian order ; specifically : 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
II. adjective
Date: 1653
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 -nē-ə-ˌni-zəm noun