'extravagance' originates from Latin, specifically the word 'extravagari,' where 'extra-' meant 'outside' and 'vagari' meant 'to wander.'

'extravagari' transformed into the Medieval Latin word 'extravagantia,' and eventually became the modern English word 'extravagance.'

Initially, it meant 'to wander outside,' but over time it evolved into its current meaning of 'excessive spending or behavior.'