means Something costly, comfortable, and inessential — a pleasure you indulge in rather than a need you meet.

from From Latin 'luxuria,' meaning excess, extravagance, even riotous overgrowth — the same root as 'luxuriant,' a plant sprawling beyond its proper bounds. The word arrived in English through Old French 'luxurie,' and for centuries it carried a whiff of moral danger, leaning toward lust and sinful indulgence before it softened into mere expensive comfort. The idea was always the same: too much of a good thing.