Augustinian
1 of 2noun
Au·gus·tin·i·an ˌȯ-gə-ˈsti-nē-ən 
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
Augustinian
2 of 2adjective
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
Augustinianism
ˌȯ-gə-ˈsti-nē-ə-ˌni-zəm
noun 
Word History
First Known Use
Noun
1534, in the meaning defined at sense 1
Adjective
1574, in the meaning defined at sense 2