/ ɪkˈstrævəgəns; NAmE / noun
1.
[ U ] the act or habit of spending more money than you can afford or than is necessary
2.
[ C ] something that you buy although it costs a lot of money, perhaps more than you can afford or than is necessary :
Going to the theatre is our only extravagance.
3.
[ C , U ] something that is impressive or noticeable because it is unusual or extreme :
the extravagance of Strauss's music
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WORD ORIGIN
mid 17th cent.: from French , from medieval Latin extravagant- diverging greatly, from the verb extravagari , from Latin extra- outside + vagari wander.