luxury

English luxury comes from Middle English luxurie, borrowed from Old French luxurie, which traces back to Latin luxuria, meaning 'rankness' or 'luxury.' That Latin word itself grew out of luxus, meaning 'extravagance' or 'luxury.'

The word passed from Latin into Old French and then into Middle English with its sense of excess and extravagance already intact.

Luxury shares its root with Latin luxus, the word for extravagance that gave rise to it, though the facts don't point to a surviving English cognate from that root.