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

Augustine, St1

Line breaks: St Au¦gust|ine
Pronunciation: /ɔːˈɡʌstɪn
 
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( 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.