Definition of “luxury” - Learner’s Dictionary

luxury

noun uk us /ˈlʌkʃəri/
COMFORT/PLEASURE [ U ]

B1 great comfort or pleasure from expensive or beautiful things:

to live in luxury
a luxury apartment/car
NOT NECESSARY [ C ]

something expensive that you enjoy but do not need:

It's nice to buy people the little luxuries that they wouldn't buy themselves.
RARE PLEASURE [ U, no plural ]

B2 something that gives you a lot of pleasure but which you cannot often do:

A day off work is such a luxury.

(Definition of “luxury” from the Cambridge Learner's Dictionary © Cambridge University Press)