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.
ごちそう refers to the lavish meal or feast itself, whereas 奢り refers to the act of someone else paying for it.
傲り (おごり) means pride or arrogance, while 奢り (おごり) means extravagance or a treat—identical in sound but written and meant differently.
Derived from the verb 奢る (おごる, 'to treat' or 'to be extravagant'). The noun form おごり nominalizes the action or state.