Refers to a luxurious or extravagant state, often implying excess or indulgence.
His lifestyle is the height of luxury.
You should refrain from extravagance.
treat (at someone else's expense)
Used when someone pays for another person's meal, drink, etc., as a treat.
It's my treat today.
My senior treated me to lunch.
Today we ate yakiniku on the manager's treat.
He has grown used to luxury and can no longer live simply.
It's my treat today, so order whatever you like.
Since it's his birthday, let's make this one a treat.