luxury

Etymology

From Middle English luxurie, from Old French luxurie, from Latin luxuria (“rankness, luxury”), from luxus (“extravagance, luxury”).

noun

1. Very wealthy and comfortable surroundings.
2. Something desirable but expensive.
3. Something that is pleasant but not necessary in life.
   As the 1857 to Manchester Piccadilly rolls in, I scan the windows and realise there are plenty of spare seats, so I hop aboard. The train is a '221'+'220' combo to allow for social distancing - a luxury on an XC train as normally you're playing sardines, so I make the most of it. December 2 2020, Paul Bigland, “My weirdest and wackiest Rover yet”, in Rail, page 68

adj

1. very expensive
2. not essential but desirable and enjoyable and indulgent.
3. (automotive) Pertaining to the top-end market segment for mass production mass market vehicles, above the premium market segment.