There are 2 main definitions of Augustine, St in English:

Augustine, St1

Line breaks: St Au¦gust|ine
Pronunciation: /ɔːˈɡʌstɪn
( Died circa 604), Italian churchman; known as St Augustine of Canterbury. Sent from Rome by Pope Gregory the Great to refound the Church in England in 597, he founded a monastery at Canterbury and became its first archbishop. Feast day, 26 May.