'erroneously' originates from Latin, specifically the word 'erroneus,' where 'errare' meant 'to wander or stray.' 'Altered' comes from Latin 'alterare,' meaning 'to change.'

'erroneus' transformed into the Old French word 'erroneus,' and eventually became the modern English word 'erroneous.' 'Alterare' became 'alterer' in Old French, leading to the modern English 'alter.'

Initially, 'erroneous' meant 'wandering or straying,' but over time it evolved into its current meaning of 'incorrect or mistaken.' 'Altered' has largely retained its meaning of 'changed.'