'augustinism' originates from Latin, specifically from the name-word 'Augustinus' (used in Medieval Latin as the basis for theology names), where 'Augustinus' ultimately derives from 'Augustus' meaning 'venerable' or 'majestic' and indicates 'of Augustine'.

'augustinism' changed from the Medieval Latin word 'Augustinianismus' (formation denoting the teachings or followers of Augustine) and passed into English usage (often as 'Augustinism' or 'Augustinianism') to become the modern English term 'augustinism'.

Initially it meant 'the teachings or followers of Augustine' and over time it has remained largely consistent, referring to doctrines influenced by St. Augustine (especially on sin and grace).